 Most distinguishing characteristics are located on the head, which is shaped differently, with a sloping forehead (rounded in the PIP), conspicuous dark red or purplish eye-wattles (none in the PIP) and eyes, and a bill that is darker at the base (lighter at the base in the PIP), being dusky purple with a pale apple-green tip.The feet are bluish-grey, mottled with varying amounts of red.The birds are slightly smaller than the PIP, with a total length of around 36 cm, females being marginally larger and darker than males on average, and juvenile birds are apparently more sandy-coloured on the upperpart feather fringes and breast.