http://www.travelcostarica.nu/mammals
Mammals developed from reptiles in the late Triassic Period, some 240 million years ago.
Here are some important features that distinguish them: Mammals have advanced brains that benefit them in many ways. Hair on their bodies insulates from the cold. Finally, they do not lay eggs, but bear live young (this way, they can stay mobile during pregnancy instead of having to guard eggs). And the production of milk provides an ever available source of food for the offspring.
Here are some important features that distinguish them: Mammals have advanced brains that benefit them in many ways. Hair on their bodies insulates from the cold. Finally, they do not lay eggs, but bear live young (this way, they can stay mobile during pregnancy instead of having to guard eggs). And the production of milk provides an ever available source of food for the offspring.
Of around 4800 mammal species worldwide, 200 can be found in Costa Rica.
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