High Quality Content by WIKIPEDIA articles! The Tongan Whistler (Pachycephala jacquinoti) is a species of bird in the Pachycephalidae family. It is endemic to the islands of Vava`u and Late in Tonga. It is mainly found in tropical primary forest, but can sometimes be seen in second growth or wooded plantations. It is similar to the Australian Golden Whistler in appearance, but the head and throat of the male is entirely black, and the underparts of the female are yellow. The Tongan Whistler is threatened by habitat loss.