Answer A Question
Highest Rated Answer
Hair or fur grows upon all mammals according to Wikipedia.
Mammal is not defined by having hair. Mammal is defined by having "mammary glands" to feed the live-birth young. Mammal:mammary. The hair just happens to be a shared charcteristic because of the very small number of species of mammals that evovled in late cretaceous, running around the feet of the dinosaurs. From those few mammal species that evolved back then (AKA a bottleneck in mammalian diversity), the rest of the mammals we know on earth evolved to fill other niches. This diversification carried with it the trait of hair, although in certain environments it would be useful to lose the hair for better survival (e.g., whales or dolphins underwater to decrease drag for swimming). So it makes sense for some mammalian species to lose the hair for survival purposes.
Other Answers
Add Comment
|
Report This
Some do not, and some of thse that dont have species that do.
Whales are hairless , but its no surprise to find one that has a little growing out of his chin
Add Comment
|
Report This
To be a mammal the organism has to have hair at some time in their life cycle, although it is possible for an organism to have hair as a fetus and lose it during development, so you'd never see the hair in any real situation.
see mammals have to have hair to be a mammal so take that in your tiny little brains!!!!
Comments
Naked mole rat. Three words only, but they make you look like a total infidel.