Territoriality is defined as the defense of a bounded physical space against encroachment by other individuals. Certain animals display such possessive behavior about their habitats, as this is where feeding, mating, or rearing young occurs. Different species exhibit characteristic behaviors in order to defend their territory, including scent marks and bird calls. The laughing kookaburra in the picture above uses its distinctive call, complete with chortles and hoots, to advertise its territory. Kookaburras keep their same territory year-round, and their characteristic laughs announce these boundaries. Although shorter calls are utilized for courtship, begging for food, and locating others, their songs are mainly used to show aggression in defending their land.