Abstract
Abstract There are more species of small mammal (less than 1 kg) than species of large mammal, with the rodents, bats, and insectivores particularly speciose. Small mammals show greater differentiation into species at both the local and the regional level. Species of small mammal tend to occupy smaller geographic ranges than large species so that, within a geographic region the size of North America, it is common to find examples of several to many parapatric species of small mammal (often congeneric), each with essentially the same ecological needs. When species of small mammal do have large ranges, they are often subdivided into many parapatric subspecies.
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