Why do some animals have long ears while some have short ears?
Answers
Answer:
No, not all of them have big ears… thier environment is a huge factor on the ear sizes and structure. Elephants and fennecs have huge ears to help cool themselves, as the huge ears have a lot of blood vessels running close to the surface of the skin. This is also a case found in animals living in hotter parts of the world- they have big ears. Animals in colder climates like arctic foxes, polar bears etc have very small ears.
It is a mammalian adaptation, since they are among very few animals that show thermoregulation (maintaining a specific body temperature regardless of the environment). Non mammals don't have ears at all.
Nocturnal mammals may have big ears for a variety of reasons- they may have to rely on hearing and smell more than sight, thus big ears (bats need to pick up thier high pitch ‘clicks’ to echo locate) for hunting as well as escaping.
So 'animals' don't generally have ears at all, only a specific group of them (mammals) have ears, and the structure, shape, and size evolve according to thier environment.
Answer:
because to act according to their geo-climate condition for activeness, survival, self protection.