Pachycephalidae

Pachycephalidae is a family of birds, including the whistlers, shrikethrushes and three of the pitohuis, comprising 69 species in five genera, of which Pachycephala, the typical whistlers, holds 51 species. The name comes from Ancient Greek words meaning thick and head, reflecting the birds stout build and strong bills, which led to the older common name thickheads. The family ranges from small to medium in size and occupies most of Australasia, with Australia and New Guinea as its center of diversity and whistlers extending to South Pacific islands such as Tonga and Samoa and to parts of Asia as far as India. They are songbirds capable of an astonishing volume of song for their size, and some pitohui species carry toxins in their feathers that deter parasites and predators. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/