Allen’s Rule

Allen’s Rule In warm-blooded animals, the warmer the climate, the longer the appendages (ears, legs, wings) as compared with closely related taxa from colder areas. In easy words, the endotherms from colder climates usually have shorter limbs than the equivalent animals from warmer climates.

allochronic speciation, Speciation that takes place related to time. Rather than space and populations that are reproductively isolated due to mating at different times.