Can you name a species that can only be found in alaska (and nowhere else in the world)?

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. 

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

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Amutation is basically the change in the gene, caused by alteration of single based units in the dna, or the genes or chromosomes were rearranged in the dna