monks — (in Christianity) a man who has withdrawn from the world for religious reasons, especially as a member of an order of cenobites living according to a particular rule and under vows of poverty, chastity, and obedience.
mammals — any vertebrate of the class Mammalia, having the body more or less covered with hair, nourishing the young with milk from the mammary glands, and, with the exception of the egg-laying monotremes, giving birth to live young.
gibbons — any small, slender, long-armed arboreal anthropoid ape of the genus Hylobates, of the East Indies and southern Asia: all gibbon species are reduced in number and some are very rare.