Behavior
A field study late in the Florida nesting season revealed that on an average day, adult American White Ibis spent 10.25 hours looking for food, 0.75 hours flying, 13 hours resting, roosting, and attending to their nests. Much of the time roosting is spent preening, biting and working their feathers with their long bills, as well as rubbing the oil glands on the sides of their heads on back plumage. American White Ibis generally only preen themselves, not engaging in allopreening unless part of courtship behavior. Bathing often takes place before preening; ibis squat in water 5–20 cm (2–8 in) deep and flick water over themselves with each wing in succession. Hundreds of birds may bathe together around the time of courtship.
The American White Ibis is territorial, defending the nesting and display sites against intruders. Agonistic or threat displays include lunging forward with the bill in a horizontal posture, and standing upright and snapping the bill opposite another bird engaging in the same display. Birds also lunge and bite, often holding onto an opponent's head or wings.
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