Abstract
blooded forms. All other things being equal, this minimum size will vary with the external temperature, and in colder climates the smallest warm-blooded animals would freeze. This is undoubtedly correlated with Bergmann's Rule which states that races living in cooler climates are larger in body size than races of the same species in warmer climates. Local temperature loss may cause discomfort, and even freezing, in relatively small parts which have a proportionally large surface. Thus fingers, toes and ears are usually the first body part to suffer cold. This is undoubtedly correlated with Allen's Rule, which states that the races of mammals living in cooler regions have relatively shorter tails, legs and ears than races of the sames species in warmer regions. It also applies to birds, with respect to relative lengths of beaks, legs and wings.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
