Only mammals nurse their babies.
Mammary glands are exclusive to mammals. This means teats are exclusive to mammals, but not all mammals have teats. The mammals that don't have them are the platypus and the echidna.
All mammals have teats, as they are how the offspring are fed milk.
She has them, so do male dogs (there are very few male mammals without teats, rats are one of the only species where this occurs). They do become more apparent with pregnancy
a cow
Colostrum from the mothers teats.
Monotremes are Australian mammals that are unique in several ways. First of all, they are the only mammals to lay eggs. Also, despite having mammary glands, they do not have teats. This caused great confusion when they were being classified, because mammary glands are one defining characteristics of mammals and the absence of teats made them difficult to locate.
Mammary glands (udders, breasts, teats, etc)
They are called teats on animals. Yes, all mammals have them.
Yes, all mammals have nipples (aka teats).
Because they give birth to live young and nourish them on teats.
Yes, just like human males have teats and cows and heifers have teats. The only difference between the teats of bulls and cows is that the teats of a bull are non-functional.
Mammals (such as cats, squirrels, and humans) provide milk to offspring with their mammary glands (or teats).