The rufous-bellied kookaburra, originally known as Gaudichaud's kookaburra after the French botanist Charles Gaudichaud-Beaupré, is a species of kookaburra which is widely distributed through the forests of lowlandNew Guinea. It has a black cap, blue-tinged wings, and a pale rufous belly and tail feathers, but its white bill distinguishes it very clearly from other kookaburras with their black bills. Juveniles, however, have a dark grey bill. Like the blue-winged kookaburra, the sexes can be distinguished by the colour of the tail feathers: blue in males and rufous in females and immaturebirds. Rufous-bellied kookaburras are smaller than other kookaburra species at around as against the laughing kookaburra's and about as against the laughing kookaburra's. Despite this major size difference, the rufous-bellied kookaburra has been known to form hybrids with all other kookaburra species, though available genetic studies suggest it is clearly the most distant of the four. This kookaburra is unusual in that it occupies dense rainforests and does not live in cooperative breeding family groups but singly or when breeding in pairs. Rufous-bellied kookaburras can be found in the middle story of the tropical rainforest, where they fly out directly and swiftly from their perch to seize large insects from trees. Despite their direct flight, rufous-bellied kookaburras are capable of very sharp twists and turns around the dense trees that form their habitat. Rufous-bellied kookaburras have been known also to hunt small vertebrates, but do so less frequently than the larger woodland kookaburras, and frequently are mobbed by smaller birds when it preys on their eggs or nestlings. Males are very aggressive in defending their territory, which averages in size, and sometimes fight intruders violently. Like their larger relatives, rufous-bellied kookaburras breed in termite mounds. Breeding usually takes place from May to October, though the young do not disperse fully until February and pairs have never been known to attempt a second brood in one year. Two white eggs are laid, though the actual incubation period is not known.
