Whales feed their young by breast feeding.
Yes whales do have belly-buttons. Whales are mammals and to be classified as such they need to fulfill certain criteria. They breathe air, have hair, give birth to live young and nourish their young with milk. When a whale is born it is still attached to the cow (mother) by the umbilical cord which then needs to be detached (exactly how this is done is not fully known). leaving behind a belly button or scientifically the 'umbilicus'.
Yes. Both platypuses and echidnas, which are the only egg-laying mammals (monotremes) nourish their young with mothers' milk. This is the defining characteristic of a mammal.
Yes. Marsupials are mammals, and the defining characteristic of mammals is that they feed their young on mothers' milk.
mammary gland
Killer whales suckle their young, for approx 12- 15 months.
Their mother's milk.
Their called mammals.
Whales and dolphins nurse their young by producing milk in their mammary glands and nursing their calves by squirting the milk into their mouths. The young calf typically nurses by swimming alongside the mother and positioning itself to suckle from her teats.
Mammary glands .
Humans are mammals, all mammals have hair and care for their young that includes breast feeding.
The mammary glands, which produce the milk, with which mammals nourish their young.
They drink milk from their mother, i think.