Hall of North American Wildlife

August 31, 2023 by Erin Southerland

The Nose that “Sees”

by Lisa Miriello

Despite the common name of the star-nosed mole (Condylura cristata), the 22 fleshy appendages at the end of its snout act more like an eye than a nose. These unique tentacles, or rays, are covered with more than 25,000 Eimer’s organs that hold over 100,000 nerve fibers (more than five times the number in the human hand) and are the most sensitive touch organs of any known mammal.

Given the mole’s poorly developed eyesight, the rays are far more useful for finding prey.

They are constantly moving and touching to identify what’s good to eat and what isn’t. Sensitive whiskers on the head and front feet also act as “feelers,” whether looking for food or navigating their way through dark underground tunnels.

close-up of the nose of a star-nosed mole — *“mole-star-nosed-4” by Brandon Motz is licensed under CC BY 2.0*

Found throughout much of eastern North America in low elevation areas with moist soils, star-nosed moles are one of three mole species found in Pennsylvania. Their preferred habitat consists of wetlands near streams, lakes, and swamps. The soft moist soil makes it easier to construct tunnels and underground chambers, and the mole’s short neck, powerful shoulders, and heavy claws make them efficient diggers. Shallow tunnels, often temporary, are used for traveling and foraging, while deeper, more permanent tunnels are used for resting, nesting, and escaping cold weather. Condylura is relatively safe from predators while underground but vulnerable to birds of prey, weasels, skunks, foxes, and snakes when out of their tunnels.

The star-nosed mole is a voracious eater that consumes 50% or more of its body weight each day. More notably, it holds a Guinness World Record for the fastest eating mammal.

Scientific studies have shown that Condylura can identify and eat prey in less than one-fifth of a second (200 milliseconds). That’s as many as five prey items per second, too fast for the human eye to follow.

Besides the worms, grubs, beetles, and other invertebrates found underground or on the surface, being near water gives them access to another hunting ground where they can find mollusks, aquatic insects, amphibians, and even small fish.

*“star-nosed-mole-3” by gordonramsaysubmissions is licensed under CC BY 2.0*.

Most moles can swim, but the star-nosed mole is the most aquatic of North American moles.

Their dense waterproof coat and large paddle-like limbs make them well suited for swimming and diving. They’ve evolved to have twice the lung capacity of other moles, and their long tail, almost one-third the length of its body, acts as a rudder. More time is spent foraging in the water than on land, and they’ve been seen swimming under the ice in winter. This remarkable mole can even smell under water by blowing bubbles, then inhaling the same bubbles to capture the scent molecules inside.

Not a great deal is known about the reproductive cycle of star-nosed moles. They’re more social than other moles, living in small colonies, and it’s believed that mating pairs stay together through the winter. Breeding season starts in early spring and the female produces only one litter a year, unless the first litter is unsuccessful. After a 45-day gestation period, two to seven pups are born in May and June. The newborns are blind and hairless with their tentacles folded against their snout. About two weeks later the eyes open and the tentacles unfurl and begin to function. The young develop rapidly and leave the nest after about four weeks, reaching full maturity at 10 months. The exact lifespan of this species is unknown but estimated to be 3-4 years in the wild.

“Baby star-nosed moles” by Hillbraith is Public Domain.

The extraordinary star-nosed mole stands out from other moles in many ways, and is certainly among the most unusual mammals in Pennsylvania. They’re not rare, but they’re not commonly seen even though they spend more time above ground than other moles. They’re active day and night, all year round, so keep your eyes peeled when you’re around water and if you’re lucky you might catch a glimpse of one.

Lisa Miriello is the Scientific Preparator for the Section of Mammals.

Groundhog Day 2023

by John Wible

January 21, 2023 was Squirrel Appreciation Day! With Groundhog Day, which commemorates our most famous squirrel, Punxsutawney Phil, right around the corner, I thought it appropriate to celebrate squirrels with this blog.

Rodents are the most diverse lineage of living mammals with more than 2,500 species, which represents nearly 40% of the species diversity of living mammals. Squirrels (Sciuridae) are one of 36 families of living rodents. There are nearly 300 species of squirrels found in the Americas, Eurasia, and Africa; a few squirrels have been introduced into Australia by humans. Broadly speaking, there are three main types of squirrels: tree, ground, and flying. Tree and ground are descriptive of their main habitats; flying squirrels also inhabit trees but are so called because of their unique locomotory pattern, which actually isn’t flying but gliding! Regarding their evolutionary relationships, all flying squirrels are more closely related to each other than to other squirrels, supporting a single origin of gliding in their common ancestor. The tree and ground squirrels do not show the same pattern; all ground squirrels are not each other’s closest relatives and the same is true of all tree squirrels. The fossil record (see text below) supports tree life as the earliest squirrel habitat, with multiple episodes of ground invasion from the trees.

In Pennsylvania, we are fortunate to have seven native species of squirrels (two ground, three tree, and two flying). You can learn more about Pennsylvania mammals at our website: https://mammals.carnegiemnh.org/pa-mammals/

Allegheny County has six of the seven PA squirrel species: the two ground squirrels (the Eastern chipmunk, Tamias striatus, and the groundhog, Marmota monax); the three tree squirrels (the gray squirrel, Sciurus carolinensis, the fox squirrel, Sciurus niger, and the red squirrel, Tamiasciurus hudsonicus); and one of the two flying squirrels (the Southern flying squirrel, Glaucomys volans). Depending on where you are in Allegheny County, you may see all six squirrels, although the Southern flying squirrel is likely the most elusive because of its nocturnal (nighttime) activities.

Squirrels have a long evolutionary history. The oldest fossils identifiable as squirrels first appeared around 34 million years ago in western North America, all showing adaptations to tree life. One of these, Protosciurus, is on display at the Smithsonian in Washington, D.C. (see below). Its skeleton is remarkably like those of living gray squirrels, both in size and morphology. Given that this remarkable similarity occurred over 30 million years of geological time, scientists consider our gray squirrel and tree-adapted relatives to be living fossils, that is, not dramatically changed compared to their very ancient relatives.

*Reconstruction of the skeleton of* Protosciurus on display at the Smithsonian’s National Museum of Natural History in Washington, D.C. *Image credit: Claire H. from New York City, USA, CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons*

Most rodents are small mammals; think mice and their relatives. Punxsutawney Phil is the second largest living squirrel; his cousin, the hoary marmot, Marmota caligata, from the Pacific Northwest is slightly larger, with adult males typically over 20 pounds. There was a larger ground squirrel that lived in western North America between 10 and two million years ago, Paenemarmota, a Latin name that translates to “almost a marmot.” Some of my colleagues have called it the “giant marmot,” which should be taken with a gigantic grain of salt! Below is an image of four ulnae, one of the two bones in the forearm. On the left is the living groundhog and next to it is the “giant marmot.” Anatomically, the bones are nearly identical, with one a little larger than the other. Weight estimates for the “giant marmot” are around 35 pounds. Yes, that is big for a squirrel, but not compared to some truly giant rodents. Next to the “giant marmot” is the ulna of the largest living rodent, the semiaquatic Central and South American capybara, Hydrochoerus, which translates to “water pig.” Capybaras, which can grow to nearly 150 pounds, are related to guinea pigs! But wait, there is more. Capybaras pale in comparison to the largest rodent that ever lived. The 8-million-year-old Proberomys from Venezuela was estimated to be the size of a large African antelope at 300 to 550 pounds. Yikes, now that is a giant guinea pig.

*Ulna (forearm bone) of select living and extinct rodents.*

Recently, one of my colleagues, Ornella Bertrand from the Universitat Autònoma de Barcelona, Spain, and coauthors have studied the evolution of the brain in squirrels. From CT scans of fossil skulls (see images below), they were able to recreate various parameters of the brain, including the relationship between brain size and body size. They found that squirrels living in trees had larger brains to their body size than other squirrels, that life in the complex arboreal environment was a driver of brain evolution in squirrels. The result of this evolutionary story for us may be that we will always be hard pressed to build a bird feeder that those big-brained tree squirrels can’t get into!

*Images courtesy of Ornella Bertrand. Middle, skull taken from CT scans of the 32-million-year-old fossil squirrel* Cedromus wilsoni from Wyoming with the blue indicating the reconstructed brain, shown separately to the right; left is Ornella’s reconstruction of the animal’s head. For 3D models made by Ornella Bertrand and more, see https://ornellabertrand.wordpress.com/3d-models/

John Wible, PhD, is the curator of the Section of Mammals at Carnegie Museum of Natural History.

Feather and Bone Connections to American History

by Patrick McShea

Within the Hall of North American Wildlife, a Passenger Pigeon taxidermy mount stands above a handful of other objects in a display case designed to spark viewers’ thoughts about human relationships with other creatures. On a text panel outside the case an eight-word statement serves to direct such thoughts:

Directly and indirectly, people and wildlife are connected.

Because Passenger Pigeons have been extinct for more than a century, reflections involving this native species are necessarily historical. An adjacent tray holding dozens of Passenger Pigeon leg bones excavated from an archaeology site in Pennsylvania’s Huntingdon County provides a helpful starting point for reflective time travel.

tray filled with passenger pigeon leg bones

The concentration of bones, which date from the years 1400-1600, is evidence of a centuries-long utilization of the birds for food by the Indigenous Peoples who lived in what’s now central Pennsylvania. Passenger Pigeons were once so abundant in eastern North America that flocks darkened the skies for hours when the birds migrated to access seasonal feeding areas and nesting sites.

Sustainable use of the birds by humans did not continue into the 19^th Century. By mid-century, Passenger Pigeons became an unregulated commodity in the rapidly expanding American economy, with the country’s growing railroad network and parallel telegraph system providing unprecedented means for sharing word of flock locations, transporting hunters to those sites, and shipping harvested birds to distant markets.

A summary statement from an exhibit about Passenger Pigeon extinction at another institution, the Milwaukee Public Museum, contains a relevant insight:

The primary factor emerged when pigeon meat was commercialized as a cheap food for slaves and the poor in the 19th century, resulting in hunting on a massive scale.

Recognizing an American slavery facet within what is commonly regarded as a natural history extinction story has never been more important. At a time when there is not consensus about how slavery should be presented as a historical topic in classrooms, the preserved remains of a once common bird have a special role to play.

In the 21^st Century, museum taxidermy mounts from the 19^th Century might serve as focal points for wide ranging discussions between the descendants of people who subsisted on Passenger Pigeon meat because they were enslaved, and those who could purchase little else because they were poor.

The exhibit described above is a component of We Are Nature: A New Natural History, an initiative that encourages a broader and deeper consideration of the human impact on our planet through a series of fifteen interpretive panels placed in and among existing exhibits, as well as a new interactive focal area where visitors are invited to record their thoughts, concerns, and hopes.

Patrick McShea is an Educator at Carnegie Museum of Natural History.

Finding Answers: From Museum to Mountains and Back Again

by Patty Dineen

The beautiful wildlife dioramas on the second floor of Carnegie Museum of Natural History have been fascinating visitors for decades. Within the Hall of North American Wildlife, most of these realistic displays feature taxidermy mounts of one or more of the continent’s large charismatic mammals, posed in recreated three-dimensional scenes of appropriate habitat that also feature smaller mammals, birds, insects, and, of course, plants.

Typically, the dioramas don’t display a generic environment, such as say, the Arctic, the mountains, or the desert, but rather, they depict specific places in North America. The key to the “where” of each diorama is the painted background. Most of the wildlife dioramas feature gorgeous and detailed renderings of specific locations in North America such as Kodiak Island in Alaska, the Laurel Highlands of Western Pennsylvania, or the beautiful Hayden Valley in Yellowstone National Park.

Diorama with taxidermy elk, fake trees other plants, and a mural for the background. — *Elk Diorama in the Hall of North American Wildlife.*

Finding the Locations That Inspired the Dioramas

Is it still possible to travel to, and view, the locations featured in these wonderful dioramas? Would those places look the same today as when they inspired artistic rendering as wildlife diorama paintings many decades ago? And first things first, how would you even go about finding the exact locations depicted in any of the dioramas? Let me tell you a brief story of a recent travel adventure that included an attempt to find the specific vantage point in Yellowstone National Park where a view of the park’s namesake river valley was long ago recreated as a painting some 1,700 miles east in Pittsburgh. The diorama in question features four American elk: two males fighting as two females watch the action from the side. The scene is a snapshot of the fall elk rut, the mating season when males compete to gather “harems” of females.

Last fall, as some museum staff made plans for a guided visit to the park, an attempt to locate and stand in the elk diorama vantage point earned a spot on our agenda.

Group of people posing for a photo outdoors.

In early October 2021, our group of 21, consisting of museum staff and their travelling companions, flew from Pittsburgh to Bozeman, Montana, and then traveled south by bus through Paradise Valley to Mammoth Hot Springs in Yellowstone National Park. From this location we began three full days of guided exploration of different parts of the 3,472 square mile park, hoping that at some point we might be able to find the “Elk Diorama” location. We were armed with the Elk Diorama label copy – “…a ritualistic bout between bull elk on the edge of the Hayden Valley, overlooking the Yellowstone River, in Yellowstone National Park,” maps of the park, and photos of the museum’s Elk Diorama. When we shared our information and diorama photos with our two professional guides, one recognized the view and said she was pretty sure she knew the location.

Map of Yellowstone National Park with Grizzly Pullout marked with large handwritten letters and an arrow.

Over our three days of exploring the park we saw geysers and other geothermal features; learned about the Yellowstone National Park wolf project and watched wolves through spotting scopes; and enjoyed wildlife sightings of trumpeter swans, black and grizzly bears, elk, pronghorn, bison, ravens, and young cutthroat trout. On the third and final day, we traveled to The Grand Canyon of the Yellowstone and Yellowstone Lake, and then headed back north from Fishing Bridge and into the Hayden Valley. And there it was — not marked on my large map but referred to by our guides as “Grizzly Pullout” — a wide spot at the side of the road where a couple of cars or a small shuttle bus could pull over for a view of the Yellowstone River as it begins a graceful bend away from the Grand Loop Road. There was the distinctive (even on this heavily clouded day) profile of distant mountains to the left and middle, and a hillside sloping up and to the right in the middle distance. Group members took photos and enjoyed what seemed a familiar landscape (many thanks to Suzanne and Andy McLaren for the photos they took at Grizzly Pullout). We then headed back to Mammoth Hot Springs for one last night in the park before heading back to Pittsburgh, the museum, and our beautiful wildlife dioramas.

View from Grizzly Pullout in Yellowstone National Park: a large tree, a fallen tree, water, sand, hills, and cloudy sky. — View from Grizzly Pullout.

Patty Dineen is a Natural History Interpreter at Carnegie Museum of Natural History.

Big Cats, Big Personalities

You may have heard the phrase “big cat” before. No, it doesn’t refer to a particularly large house cat, but rather to a category of cats. “Big cat” is a term typically used to describe any member of the genus Panthera, though it can mean different things to different people.

Some consider every member of the larger subfamily Pantherinae to be big cats—for example, clouded leopards (genus Neofelis). Sometimes, the phrase “big cat” just refers to any member of the cat family (Felidae) that is large, such as the cougar (genus Puma), the cheetah (genus Acinonyx), and the Eurasian lynx (genus Lynx, species lynx).

Tigers, Lions, Jaguars, Leopards, and Snow Leopards are the extant (or currently living) members. You may be wondering how leopards and snow leopards are members of genus Panthera but clouded leopards are not. Clouded leopards are not true leopards—they branched off into their own genus roughly six million years ago; they are in the larger subfamily of Pantherinae, but not Panthera specifically.

One feature sometimes used to distinguish big cats from other cats is the ability to roar, but that ability is only found in the Panthera genus, not the additional species. Roaring itself is an important vocalization, but it isn’t a surefire way to distinguish what a “big cat” is. For example, snow leopards, in the family Panthera, cannot roar.

So, big cat can mean something different to everyone, but let’s learn a little bit more about each of the cats listed above:

Tigers

Tigers are the largest cat species on the planet! There are several subspecies and they are easily recognized by their orange color with black stripes (though Bengal tigers are occasionally white with black stripes).

They are solitary and territorial animals; cubs (big cat offspring are not called kittens) stay with their mother for 2 years. These cats are found throughout Asia—although they are endangered—and their population is dwindling.

Lions

Lions are a social species of large cats found in the grasslands and savannas of Africa. Males are recognizable by their long hair surrounding their necks, called manes. Lionesses do the hunting for the pride (social group of lions), which is comprised of several adult males, related females, and cubs. These animals are listed as vulnerable, which means they are close to becoming endangered.

Jaguars

Jaguars are the only member of the Panthera genus found in the Americas. Individual cats can be found in the Western United States, but they have had a reduced range in Central and South America since the early 20^th century. They are solitary animals and ambush predators, hunting in tropical and subtropical forests and swamps. They are recognizable by their spots, which are black rosettes with spots in the middle. However, melanistic (or all black) jaguar occasionally appear; these cats are informally known as black panthers—although they are not a separate species—and the phrase “black panther” has been used to describe melanistic leopards as well. Jaguars are near-threatened, which means their numbers are decreasing and their populations are being closely monitored.

Leopards

Leopards have a wide range and are found in Sub-Saharan Africa, in parts of Western and Central Asia and on the Indian subcontinent. They are recognizable by their spots; they look like jaguars with their spotted fur, but leopards are shorter with a smaller head, and their rosette-shaped spots do not have dots in the middle. Leopards are opportunistic hunters, hunting mostly on the ground at night; though in the Serengeti, they are known for attacking prey by leaping from trees. Leopards are listed as vulnerable, meaning they are potentially on their way to the endangered species list.

Snow leopards

Snow leopards live in the mountain regions of Central and South Asia, living at elevations from 3,000 to 4,500 feet. Their fur is whitish grey, with black rosettes, distinguishing them from other leopards which are yellow or brown in color. Snow leopards have large nasal passages which helps warm the cold, dry air they breathe. Their tails are covered thickly with fur and provide fat storage; sleeping snow leopards use their warm tails like blankets to protect their faces when they sleep. They are listed as vulnerable, meaning they may appear on the endangered species list in the future.

Clouded leopards

photo of a clouded leopard lounging on a branch

There are two species of clouded leopards—the mainland clouded leopard (Neofelis nebulosa) and the Sunda clouded leopard (Neofelis diardi). The mainland clouded leopard is found in the Himalayan foothills in Southeast Asia and southern China and the Sunda clouded leopard is found in Borneo and Sumatra. They are considered an evolutionary link between two cat families Pantherinae and Felinae. Their fur is dark grey with a black blotched pattern. Clouded leopards are solitary and hunt by stalking or ambushing prey. They are excellent climbers and use trees as rest sites. Both species of clouded leopards are listed as vulnerable, meaning they can potentially end up on the endangered species list.

Cougar

The cougar (also known as a puma, mountain lion, red tiger, or catamount) is the only cat on this list that you may see in the wild around Pittsburgh; however, their populations are severely reduced in the eastern half of North America. These cats are adaptable to a wide variety of habitats, which is why they are found all throughout North and South America. This wide range is the reason people living in different regions have different names for them. They are ambush predators, preferring to hunt deer, though they will eat insects and rodents. While cougars are large, they are not always the apex (or top) predator and will occasionally give food they caught away to jaguars, grizzly bears, or even alligators! Cougars are listed as least concern, meaning their population is holding steady, though their range has shrunk.

Cheetah

Cheetahs are known for their speed; as the fastest land animal, they are capable of running up to 80 miles per hour! Cheetahs can be found in the Serengeti, Saharan mountain ranges, and in hilly areas of Iran. Cheetahs separate into three kinds of social groups—females with cubs, all-male groups, and solitary males. Females are more likely to travel further distances while males will establish and stay in smaller territories. They are active during the day and spend most of their time hunting for things like impala or springbok. Cheetahs are listed as vulnerable, with one of the main threats being a lack of genetic diversity, which makes it difficult for the species to adapt and evolve over generations, reducing the chance for individual animals to survive.

Eurasian lynx

The Eurasian lynx is found from Europe into Central Asia and Siberia, living in temperate or boreal (snow or Taiga) forests. They have short, red-brown coats, and are more colorful than most animals sharing their habitat. In the winter, their fur grows in thicker and greyer. These cats have relatively long legs and large webbed and furred paws that act like snowshoes, allowing them to walk on top of the snow. They have bobbed (or short) tails, much like one of their cousins you might see around Pittsburgh—the bobcat. They hunt small mammals and birds but will occasionally take down young moose or deer. The Eurasian lynx is listed as least concern, with a stable population.

Jo Tauber is the Gallery Experience Coordinator for CMNH’s Life Long Learning Department, as well as the official Registrar for the Living Collection. Museum staff, volunteers, and interns are encouraged to blog about their unique experiences and knowledge gained from working at the museum.

Bright Flying Mammal

museum display of mammals found in Pennsylvania — Mammals of Pennsylvania within the Hall of North American Wildlife

Can you name our region’s most colorful mammal? If the question was asked in front of the museum’s Mammals of Pennsylvania display, many people would choose the red fox near the center of the exhibit’s floor-level row.

Five feet above fox, and just inches from the tip of a raccoon’s tail, a far smaller, but equally bright alternate exists in the form of a gliding eastern red bat.

Eastern red bat — Eastern Red Bat, known to science as Lasiurus borealis

In color, red bat fur ranges from golden brown to bright rusty orange, with males typically sporting brighter shades than females. The bright fur coats of this widespread insect-eating species provide surprisingly effective camouflage when the bats are at rest. Red bats are tree bats, a term that indicates the species’ preference for spending daylight hours roosting within the foliage of deciduous and sometimes evergreen trees.

With wings folded, they hang upside-down from the grip of a single foot, looking, to casual observers, like dead leaves or pine cones.

Red Bats have so far escaped the devastating effects of white-nose syndrome, a fungal disease that since 2007 has caused mortality rates as high as 90% at hibernation sites of many other bat species. Remarkably, on fall migration flights to southern portions of their North American range, red bats have been known to cross long stretches of territory with flocks of migrating birds.

For more information about eastern red bats, please check the species account prepared by Bat Conservation International.

For information about the vital ecosystem contributions of the world’s 1,300 bat species please visit Merlin Tuttle’s Bat Conservation.

Patrick McShea works in the Education and Visitor Experience department of Carnegie Museum of Natural History. Museum employees are encouraged to blog about their unique experiences and knowledge gained from working at the museum.

The Nose that “Sees”

by Lisa Miriello

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Groundhog Day 2023

by John Wible

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Feather and Bone Connections to American History

by Patrick McShea

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Finding Answers: From Museum to Mountains and Back Again

by Patty Dineen

Finding the Locations That Inspired the Dioramas

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Big Cats, Big Personalities

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Bright Flying Mammal

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