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If a crocodile has a four chambered heart, this is it not considered a mammal similar to dolphins and whales or platypuses and echidna? Is it because they don't have mammary glands ? Do whales and dolphins have mammary glands if no why are they mammals? PS- sorry for grouped questions but these are very closely related...

Answer» If a crocodile has a four chambered heart, this is it not considered a mammal similar to dolphins and whales or platypuses and echidna? Is it because they don't have mammary glands ? Do whales and dolphins have mammary glands if no why are they mammals?


PS- sorry for grouped questions but these are very closely related...


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