NOT a hedgehog. Baby Echidnae: No, not a hedgehog which is an insectivore or a porcupine which is a rodent, but an echidnae which is a monotreme (lays shelled eggs). They live in Australia and New Guinea, where there are neither hedgehogs nor porcupines.
We had a hen who did this also. From the time the kittens were born, she would sit on them and keep them warm while the mother was out hunting, and then they'd trade places while the hen ate so the cat could feed her kittens.