An
udder is an organ formed of the
mammary glands of
female quadruped
mammals, particularly
ruminants such as
cattle,
goats,
sheep and
deer. The udder is a single mass hanging beneath the animal, consisting of pairs of mammary glands. In cattle there are normally two pairs, in sheep, goats and deer there is one pair, and in some animals such as
pigs there are many pairs. In animals with udders, the mammary glands develop on the
milk line near the groin, and mammary glands that develop on the chest (such as in
humans and
apes) are generally referred to as
breasts.
