| 单词 | allen's rule |
| 释义 | Allen's ruleAllen's rulea rule stating that in warmblooded animals (HOMOIOTHERMS) there tends to be a reduction in size of protruberant parts of the body (such as legs, bill, tail) in populations living in cooler climates; for example, within some species of birds, such as the redshank, the length of the bill is reduced. This size reduction is an extension of BERGMANN'S RULE and is also a mechanism to reduce heat loss. The rule was devised by J.A. Allen in 1877. |
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