The Guira Cuckoo (Guira guira) is a social, non-parasitic cuckoo found widely in open and semi-open habitats of eastern and southern Brazil, Uruguay, Paraguay, Bolivia, and north-eastern Argentina. It is monotypic within the genus Guira, and is related to the anis.
It has whitish-buff underparts and rump, dark brownish upperparts, a broadly white-tipped dark tail that is relatively long, an orange-rufous crest, bare yellow ocular-skin (commonly fades in captivity), and a relatively heavy, orange-yellow bill. It is generally rather shaggy-looking and has a total length of approximately 34 cm (13 in). Like other members of the subfamily Crotophaginae, the Guira Cuckoo gives off a strong, pungent odour.
The Guira Cuckoo is arboreal, but can frequently be seen on the ground, usually in flocks of 6 to 18 individuals. It is sometimes seen with other birds such as the Chalk-browed Mockingbird (Mimus saturninus) and the Smooth-billed Ani (Crotophaga ani) whose behaviour is similar.
The Guira Cuckoo feeds on big arthropods, frogs, small birds and small mammals such as mice.
The nest is built on a tree fork 5 metres from the ground. The eggs (from 5 to 7) are dark green and covered with a chalky layer. They are incubated either in individual or community nests; in the latter one can find up to 20 eggs. Under community nests there are many broken eggs. The competition between young being great, mortality is significant.