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soaring
Muscles, bones ect... Think of a human, humans are mammals also and have very similar internal organs as other mammals.
A human's spine has more movement than that of most mammals
All mammals use internal fertilization.
All mammals use lungs to breath.
whales and dolphins are both mammals that use waterways.
Bats (many species) are the only mammals that can truly fly.
they may bite making threatening noises or movement ,or they use their claws is they have any. and also build berror around them
Erasmus Darwin
Egg-laying mammals, known as monotremes, use lungs like all mammals do.
yes mammals do use internal reproduction as they are more likely to survive longer as they are less likely to be eaten.
Their lungs.