Mammary glands (udders, breasts, teats, etc)
The mammary glands, a defining characteristic of mammals.
Mammals have a body covering of hair or fur.
Birds and mammals are air breathers. Lampreys are not.
It is rephrased as mammals are homeothermic animals .
precision grip
a Shared ancestral characteristic a shared primitive characteristic
Dolphins are warm blooded like other mammals.
Having hair is a characteristic of all "mammals."
As with all mammals, the echidna feeds its young on mothers' milk.
Mammal.All mammals feed their young on mothers' milk. This is the defining characteristic of a mammal, and it is a characteristic not shared with any other vertebrate.Mammals include placental mammals, marsupials and monotremes (egg-laying mammals).
The young are nourished in the womb by the placenta.
The naked mole rat. There are many mammals with no hair. The characteristic that sets mammals apart from birds, reptiles and fish is that they have fur, skin or hair.