The success of mammals is due in large part to several highly effective reproductive strategies, which include

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All of the above strategies (the mammary gland for nourishing their young, the placenta for supporting the growth of the embryo, and internal fertilization) have played a key role in the success and proliferation of mammalian species. The development of the mammary gland allowed for the nourishment of offspring with milk, providing them with essential nutrients and immune factors. The placenta allowed for the development of a highly efficient means of embryonic nourishment and waste disposal, promoting successful fetal development. Finally, internal fertilization enabled greater agility and mobility in mating behaviors and offered greater protection against external threats to reproductive success.

The Success of Mammals Is Due in Large Part to Several