Presently, arctic foxes and insular voles are the only mammals resident on the island, though polar bears occasionally visit via pack ice.

Insular vole (M. abbreviatus)

On these Bering Sea islands, insular voles live in damp lowland areas, on the lower slopes of mountains, and on rye grass-covered beaches.

The insular vole or St. Matthew Island vole (Microtus abbreviatus) is a species of rodent in the family Cricetidae.

The closest living relative of the Singing Vole today is the Insular Vole, which is found only on two small islands off the west coast of Alaska, and probably diverged as those islands were cut off from the Beringia land bridge by rising sea levels.

The insular vole or St. Matthew Island vole (Microtus abbreviatus) is a species of rodent in the family Cricetidae.