The conception and birth of the armadillo are odd events. Although mating usually occurs in July, the embryos of the armadillo remain in a dormant state until November. Later in March, four young are born. Armadillos are the only mammals in which multiple young form from a single egg with any regularity. All four of the young, always of the same sex, are identical quadruplets and developed from the same egg. They even shared a single ---------- while in the womb.?