Because animals never had to deal with winter before
Winter Storms Impact Connecticut Wildlife In Different Ways by Gregory B. Hladky
Bitter cold and heavy snowfall of the kind we’ve been experiencing lately is usually just an inconvenience for people. For Connecticut’s wildlife, these violent winter storms can be life or death events.
Deep snow can make finding food tough for animals and birds. Sustained frigid temperatures are often even more dangerous, according to state wildlife biologists. And most scientists agree that climate change is likely to bring us more volatile weather patterns, including frequent and harsher winter storms, creating new challenges for our wildlife.

Pretty much the rest of the article ignores the notion of Hotcoldwetdry, but, one has to wonder how these same birds and animals survived during the Little Ice Age, much less the last glacial age. As for the notion of heat creating “frequent and harsher winter storms”, these people are just nuts.

