can be killed at temperatures endotherms regulate temperature by the production of heat within their own bodies, and can survive in cold areas ectotherms rely on external sources of heat, and therefore have ranges which are limited by temperature Allen's rule: animals from cold climates usually have shorter extremities than animals with otherwise similar characteristics from warmer climates Bergmann's rule: animals with a wide distribution are larger in the colder areas of their range 4.
(ranges; are limited; by temperature Allen's rule) (animals from cold climates; have; shorter extremities than animals with otherwise similar characteristics from warmer climates Bergmann's rule; T:usually) Context(animals from cold climates have,List([261, 300))):(ectotherms; rely; on external sources of heat) (animals from cold climates; are; larger; L:in the colder areas of their range 4) (ectotherms; therefore have; ranges which are limited by temperature Allen's rule)
animals from cold climates have,List([261, 300))
ranges animals from cold climates ectotherms animals from cold climates ectotherms
are limited have rely are therefore have
by temperature Allen's rule
shorter extremities than animals with otherwise similar characteristics from warmer climates Bergmann's rule T:usually
on external sources of heat
larger L:in the colder areas of their range 4
ranges which are limited by temperature Allen's rule