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

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

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