The asities are a family of birds, Philepittidae, that are endemic to Madagascar. The asities consist of four species in two genera. The Neodrepanisspecies are known as sunbird-asities and were formerly known as false sunbirds. Philepitta is now the type-genus of a new bird family, the Philepittidae, into which the asities of Madagascar have been placed.
They were thought to have been related to the pittas, hence the scientific name of the family, but a 1993 study suggested that they are actually just a subfamily of Eurylaimidae. The morphology of the syrinx is very similar to the Grauer's broadbill of Africa. Here they are considered traditionally as a separate family. Some authors have placed the sapayoa of South America in the family, although it is now considered by many to be in its own family, the Sapayoidae.
Description
Asities are small forest birds with sexually dichromicplumage and brightly coloured wattles around the eyes of the males. These wattles, which are most conspicuous during the breeding season, get their colour from arrays of collagen fibres. This method of pigmentation is unique in the animal kingdom. Several other features separate them from the broadbills, they possess twelve tail feathers on extremely short tails, their syrinx is encased with a large bronchial ring and they have forked tongues adapted to nectivory. They have a long outer primary which buzzes in flight, possibly used in signalling during courtship. The two genera are quite distinct.
The major component of the diet of asities is fruit. A wide range of different fruit is taken by the family, and they are among the most important avian dispersers of seeds, as there are very few other frugivorous birds in the forests of Madagascar. They will also take insects. The Neodrepanis sunbird-asities will take nectar, but do so with a long tongue rather than inserting their curved bills far into flowers.
Breeding
Rainforest asities breed during the Malagasy rainy season, beginning just before the rainsin September to November. The velvet asity begins breeding slightly sooner in the north of its range. That species is the only one for which detailed information about breeding is available. It has a polygynousbreeding system, with males holding small territories or leks where they display to passing females. Nest building and raising the young is incubation solely by the females. There are reports of yellow-bellied sunbird-asities feeding young in the nest and recently fledged chicks, so there is clearly some variation in breeding strategies in the family. The nests of the family are elaborate; pear-shaped woven structures hanging from branches, similar to those of broadbills, although uniquely amongst birds which weave nests the entrance to the nest is pushed created by pushing through the wall after constructed.
