Display is a form of animal behaviour, linked to survival of the species in various ways. Some species use display as a form of courtship, with the male usually having a striking feature that is distinguished by colour, shape or size, used to attract a female. Other species may exhibit territorial display behaviour, in order to preserve a foraging or hunting territory for its family or group. A third form is exhibited by tournament species, in which males will fight in order to gain the 'right' to breed. Ethology is the scientific study of animal behavior considered as a branch of zoology. ... Foraging just means looking for food (or, metaphorically, anything else). ... This snapping turtle is trying to make a meal of a Canada goose, but the goose is too wary. ... Tournament species in zoology are those species in which members of one sex (usually males) compete in order to mate. ...