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Section of Mammals

Carnegie Museum of Natural History

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Mammals of Pennsylvania

The following is a list of the 70 mammals known to live or have lived in Pennsylvania. The list provides common names and currently recognized scientific names. Click on the name or image for additional information.

Maps are shown for each species whose current distribution is known. Some mammals are found throughout the Commonwealth of Pennsylvania. Others have very limited distribution due to such factors as soil requirements, food preferences, or geographic barriers to dispersal. The larger map on each mammal page shows the counties from which specimens are represented in our collection. Specimens of all these species are found in the research collection of the Section of Mammals at Carnegie Museum of Natural History. However, we do not have Pennsylvania specimens for some of the “long gone” species such as the wolf and the mountain lion.

Learn more about mammals or use the filtering options below to group the mammals by family, habitat, or diet. Images provided by the American Society of Mammalogists Mammal Image Library.

Old World rats and mice (Muridae)

House Mouse

August 24, 2017 by

House Mouse (Mus musculus)

This Old World rodent is the common pest found living in houses, barns, and other human habitations. It arrived in the New World as a stowaway on board ship and has lived successfully around people for centuries.

Black Rat

August 24, 2017 by

Norway Rat (Rattus norvegicus)

This animal is a good swimmer and climber whose opportunistic behavior has led to its successful worldwide distribution. This Old World rodent did not originate in Norway but in China. It is a serious pest of granaries and other food storage sites and a vector of numerous diseases communicable to humans. Most sources state strongly that efforts should be taken to control of Norway rat populations whenever possible.

Pennsylvania Counties for Black Rat

August 24, 2017 by

Black Rat (Rattus rattus)

This species is thought to have been extirpated from (forced out of) the Commonwealth by pressure from the more aggressive Norway rat. Although some individuals may continue to find their way to coastal seaports such as Philadelphia via incoming ships, it is unlikely that populations will be successfully re-established.

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