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Weasels feed on small mammals and have from time to time been considered vermin because some species took poultry from farms or rabbits from commercial warrens. They do, on the other hand, eat large numbers of rodents. Their range spans Europe, North America, much of Asia and South America, and small areas in North Africa.
Skulls of a long-tailed weasel (top), a stoat (bottom left) and least weasel (bottom right), as illustrated in Merriam's Synopsis of the Weasels of North America. The long-tailed weasel is the product of a process begun 5–7 million years ago, when northern forests were replaced by open grassland, thus prompting an explosive evolution of small, burrowing rodents.
The giant kangaroo rat (Dipodomys ingens) is endemic to California. Order: Rodentia Family: Heteromyidae. Twenty-six species of pocket mice and kangaroo rats occur in California. Subfamily Dipodomyinae (kangaroo rats and mice) Pacific (or agile) kangaroo rat, Dipodomys agilis (endemic) California kangaroo rat, Dipodomys californicus
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The least weasel is the product of a process begun 5–7 million years ago, when northern forests were replaced by open grassland, thus prompting an explosive evolution of small, burrowing rodents. The weasel's ancestors were larger than the current form, and underwent a reduction in size to exploit the new food source.
Sthenictis sp. (American Museum of Natural History). Mustelids vary greatly in size and behaviour. The smaller variants of the least weasel can be under 20 cm (8 in) in length, while the giant otter of Amazonian South America can measure up to 1.7 m (5 ft 7 in) and sea otters can exceed 45 kg (99 lb) in weight.
Family Mustelidae (otters, weasels and relatives) North American river otter (Lontra canadensis) RI; Least weasel (Mustela nivalis) U; American ermine (Mustela richardsonii) U [11] Long-tailed weasel (Neogale frenata) U; American mink (Neogale vison) U; Fisher (Pekania pennanti) RI; Family Mephitidae (skunks) Striped skunk (Mephitis mephitis) C