Animal locomotion many of these same principles may be applied to climbing without trees, such as on rock piles or mountains. The earliest known tetrapod with specializations that adapted it for climbing trees, was "Suminia", a synapsid of the late Permian, about 260 million years ago. Some invertebrate animals are exclusively arboreal in habitat, for example, the tree snail. "Brachiation" (from "brachium", Latin for "arm"), is a form of arboreal locomotion in which primates swing from tree limb to tree limb using only their arms. During brachiation, the body is alternately supported under each forelimb. This is the primary means of locomotion
Animals in Buddhism but by state of mind. This world was called "Tiryagyoni" in Sanskrit, "Tiracchānayoni" in Pāli. Rebirth as an animal was considered to be one of the unhappy rebirths, usually involving more than human suffering. Buddhist commentarial texts depict many sufferings associated with the animal world: even where no human beings are present, they are attacked and eaten by other animals or live in fear of it, they endure extreme changes of environment throughout the year, and they have no security of habitation. Those that live among humans are often slaughtered for their bodies, or taken and forced to work with