Behavioral Pattern of Endemic Sri Lanka Grey Hornbill (Ocyceros gingalensis) within the Breeding and Nonbreeding Seasons

Table 1

Type of behavior	Behavioral act	Behavioral event
Self-maintenance behavior	Cleaning	Preening, bill cleaning, wing stretching, puffing plumage, sand bathing, scratching
	Foraging	Picking fruits, darting, pouncing, killing and feeding, searching, holding
	Shelter seeking	Standing posture, sitting posture, roosting, perching
	Elimination	Defecation
	Defense	Attacking, pecking on glass windows, long aggressive calls
Reproductive behavior	Pair bonding	Touching beaks, feeding each other
	Courtship and mating	Intercourse
	Nest selection	Nest searching, carving the entrance, covering up the entrance, incubating eggs, nest guarding, regurgitating, feeding the female and the brood, nest cleaning
Territorial behavior	Territorial display	Charging each other, aggressive calls, showing off
Other behaviors	Collision with glass window	Looking at glass window, colliding with it in a high speed