Milkwights are a breed of beings that have breasts and feed their young on milk. Most milkwights give birth to their young, though some lay eggs.

All milkwights live on ground, walking on all fours. However, some have arms (like men) or wings (such as birds and bats). Others, like whales, live in water.

There are about 5½ thousand known milkwights to have lived on Earth.