During the Pleistocene Era, roughly 1.8 million b.c.e to 10,000 b.c.e. Pennsylvania was inhabited by various numbers of megafauna. Everything from Mammoths (both Columbian and Wooly) to the American mastadon, lions, ground sloths, musk oxen, wood bison, dire wolves, short faced bears, saber tooth cats, caribou, elk, moose, etc. etc. This is just a small example of typical types of megafauna found in the region, however, there are are myriad of other fauna that once inhabited the region but are now extinct. The variance and survival of these species could have stretched into the early Holocene Epoch (10,000b.c.e.) but research (Archaeological data) to substantiate this is limited but ongoing. Hope this helped...
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Wisconsin does have many dairy cattle. However it has many other animals including white-tailed deer, red squirrels, gray squirrels, beavers, badgers, frogs, turtles, coyotes, eagles, hummingbirds, robins, song sparrows, cardinals, wood peckers, and many others.