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This list of mammals in Pennsylvania consists of 66 species currently believed to occur wild in the state. This excludes feral domesticated species such as feral cats and dogs . Several species recently lived wild in Pennsylvania, but are now extirpated (locally, but not globally, extinct).
The species is sexually dimorphic, with males being significantly larger than females in most subspecies. Because of their long winter hibernation , during which they survive on fat reserves, the weight of the animals varies considerably over the course of the year, from an average of 3.75 kg (8.3 lb) in May to around 7 kg (15 lb) in September ...
[46] [47] To survive the winter, they are at their maximum weight shortly before entering hibernation. [48] When the groundhog enters hibernation, there is a drop in body temperature to as low as 35 degrees Fahrenheit (2 °C), heart rate falls to 4–10 beats per minute and breathing rate falls to one breath every six minutes. [49]
Dru Burdon said warmer winter weather reduced the need for hedgehogs to hibernate [BBC] Wildlife experts in the Channel Islands say warmer temperatures are leading to fewer hedgehogs hibernating ...
After torpor and hibernation diverged from a common proto-hibernating ancestor of birds and mammals, the ability to hibernate or go through torpor would have been lost in most larger mammals and birds. Hibernation would be less favored in larger animals because as animals increase in size, the surface area to volume ratio decreases, and it ...
The Jersey Hedgehog Preservation Group encouraged people to leave out dishes of water and bowls of dry cat food since the food would remain fresh for a few nights and benefit the teeth of the mammals.
State wildlife officials estimate the state's black bear population has remained stable for the past 10 years at 50,000 to 81,000 to animals. Bears can hibernate under decks, in crawl spaces
Although difficult to catch, the American mink, prior to being commercially farmed, was among the most frequently trapped furbearers as, unlike other furbearing mammals, it did not hibernate in winter, and could thus be caught on a nightly basis even in the far north. [67]