Answer :

Some species we see in Alaska and nowhere else in the Wolrd are:

Bats
Shrews
Bears
Seals
White Wolfs
Sea lions
Racoons
Walrus. 

Bears, Seals, White Wolfs and Sea lions survive the cold weather much more than those other animals. 
View image Аноним
View image Аноним
View image Аноним
The Spruce Grouse can be an option.

The Spruce Grouse is a bird endemic to the region of Alaska that is unique, since from all the Grouses, this is the one that spends the most time on trees.





Hope it helped,





BioTeacher101