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Most mammals primarily use their legs for movement. These limbs are adapted for various forms of locomotion, including walking, running, and jumping. Some mammals, like bats and whales, have evolved specialized limbs for flying and swimming, respectively, but the general organ associated with movement across most mammalian species remains the legs.
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.
they may bite making threatening noises or movement ,or they use their claws is they have any. and also build berror around them
Bats (many species) are the only mammals that can truly fly.
Egg-laying mammals, known as monotremes, use lungs like all mammals do.
Erasmus Darwin
yes mammals do use internal reproduction as they are more likely to survive longer as they are less likely to be eaten.