MAMMALS Reading: Chapter 34, pp. 752-755.
A. MAJOR LINEAGES OF MAMMALS
Found only in Australia, New Guinea. Represented only by one species of
platypus and four species of spiny anteaters. They lay eggs, they have hair and
produce milk but lack nipples. (Milk is secreted by glands on belly of mother and
baby sucks fur to obtain milk.)
Give birth to live young very early in their development and then are held within a
maternal pouch (marsupium) to complete their development. (The embryo