Echidnas are monotremes, an order of egg-laying mammals.
To make things even weirder, the spiny creatures, which are native to Australia and New Guinea, also keep their eggs safe in a little pouch - similar to how marsupials carry around their young. The only other known monotreme is the platypus.
This 1974 CSIRO clip from Comparative Biology of Lactation shows amazing footage of a baby echidna (known as a PUGGLE! Can it get any cuter) hatching from its egg.
It also explains how they go on to drink milk, not from nipples, but secreted straight from patches of their mothers’ skin.
Day is made.