The Papuan frogmouth is the largest of
frogmouths in terms of length. Average sizes indicate that it only falls behind the
Neotropical
great potoo and
oilbird (if the latter is a true member of the order) among the largest species in the order
Caprimulgiformes. On average these birds are about , with a range of . This species was found to average in males and in females, with a total range of . The
tawny frogmouth is smaller on average than this but is capable of reaching higher maximum weights. The Papuan frogmouth has a bulbous bill, red eye, cream eyebrow, long tail and dark wings. The male of the species is slightly larger, darker and marbled in appearance. The female is more rufous in appearance.
P. p. baileyi is smaller, and darker.
P. p. rogersi is larger and paler. Similar species include the
tawny frogmouth. The Papuan frogmouth is larger, has red eyes, a longer tail, and darker wings. ==Distribution and habitat==