Vulpes vulpes
Small herds of Porcupine caribou (or Grant's caribou, "Rangifer tarandus grantii") are frequently found on the island in summer. Muskox, and grizzly bears are occasionally seen, crossing to Herschel from the mainland. Lemmings, tundra voles and Arctic shrews are common. Red and Arctic foxes are also known to den on the island. Natal Arctic fox dens are found each year on the island, usually one or two, but occasionally more. Red foxes also reproduce on the island but natal red fox dens are not observed every year.