Chicks have a hook on the upper mandible, which disappears by the time of fledging. If there isn’t enough food, the chicks will quarrel, with the hook being used as a weapon, and the smallest chick may even be killed by its larger siblings. If food is plentiful, the parent birds spend more time brooding the chicks, so the chicks are not able to fight.
|Laughing kookaburra (Dacelo novaeguineae). (© LightColourShade. All rights reserved)|