The Andean Cock-of-the-rock, Rupicola peruviana is a spectacular, medium-sized passerine which is known to be pretty shy and not easily spotted. They emit a loud querulous "uankk?" when disturbed or in flight.
They average 32 cm (12½ in) in length (from beak to tip of tail). The species exhibits marked sexual dimorphism (which means they can be visually sexed)..
Cocks:
The male has a large disk-like crest and scarlet or brilliant orange
He has black tail and wings
His bill is yellowish
His irides (= plural of iris) range from red over orange and yellow to bluish-white
Hens:
The female is significantly darker and browner than the male and has a shorter crest.
Her bill is dark with a small yellow tip
Her irides (= plural of iris) are whitish over reddish to brown
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