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 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. 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 called mammals.
Their mother's milk.
Mammary glands .
The mammary glands, which produce the milk, with which mammals nourish their young.
A mother's breasts provide milk to nourish and feed her baby. The milk contains essential nutrients for the baby's growth and development.
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.
They drink milk from their mother, i think.