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It is estimated that breast-feeding began more than 200 million years ago, the time of the first
mammals (Which
laid eggs and hatched them). Subsequently no less than 18,000 different species of mammals
evolved.
The
kangaroo has the unique ability to produce two types of milk from two teats for young of
different ages. It is
curious that the number of teats or nipples varies throughout the mammalian world. The horse
and elephant, for
instance, have only two nipples; and though the cow has only one udder the single massive
gland empties into
four teats. The dog has five paired glands. The hog can have as many as eighteen mammae.
Supernumerary
nipples are common in many species, e.g. primates, rodents, ruminants. The largest number of
nipples is present
in Centetes, a primitive insectivore with twenty-two to twenty-four nipples and as many as
thirty six young at
birth.