Калао сулавеський Rhyticeros cassidix

A huge black hornbill with a prominent knob on the bill, conspicuous red “gills” on the sides of the beak, a turquoise-blue throat pouch, and a white tail. Males have a red casque and rufous neck, females a yellow knob and black neck. Juveniles resemble male, but with an entirely yellow casqueless bill. Found in pairs or groups in canopy of forested and wooded areas of lowlands and hills. Larger and more colorful than Sulawesi Hornbill. Gives powerful, short “krok” notes and a more drawn-out “oooo-aa-ooo-aaa.”