The Guira Cuckoo is perhaps the most common cuckoo over a diversity of drier habitats from the mouth of the Amazon south to central Argentina. The Guira Cuckoo is highly social and is generally seen in flocks of 6-8 birds which can accrue to over 20 individuals at times, especially after breeding. The species also breeds communally, with several females laying up to 20 eggs in a single nest. Within the nest, there is much competition between parents and only a quarter of the eggs survive to fledging, the remainder are destroyed or buried or killed as hatchlings by competing adults. It feeds on large arthropods, frogs, eggs, small birds (especially nestlings) and small mammals such as mice.