Mammals
-possesses four-chambered hearts that circulate blood efficiently to all parts of the body.
-Most of them give birth to living young
provide protection and care for them before and after birth
-possess hair
-produces milk
Amphibians
-cold-blooded animals
-have moist, scaleless skin that absorbs water and oxygen
-vulnerable to dehydration (loss of bodily fluids)
-Some amphibians become inactive when conditions are unfavorable for survival.
-thin skin of amphibians contains many glands, among them poison glands that protect certain species against predators.
-Some amphibians protect themselves from enemies by changing color to blend in with their surroundings.
-breath through their skins
Read more: http://wiki.answers.com/Q/What_are_characteristics_of_amphibians#ixzz1AbJH2WGF
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