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Nest parasitism in waterfowl
In Chris Bochu?s response to John Bois, he remarked that nest parasitism is
unknown in waterfowl.
A number of species of ducks regularly parasitise other duck species on an
One species, the Black-headed Duck _Heteronetta atricapilla_ of South America
is an obligate brood parasite. It has been recorded parasitising at least 18
species, including ducks, but also coost and other rails, ibises, herons and
even a caracara, a scavenging falconiform. A difference between parasitism by
this duck and birds such as cuckoos, honeyguides and viduine finches is that
the young are precocial. They make no demands on the host species other than
for a site and warmth for incubation. After hatching the ducklings leave the
nest and look after themselves, leaving the host chicks unharmed.