For two centuries, an unusual bird
had been kept in wrong company.
The hoatzin of South America, the
only bird species to have a ruminant
digestive system like a cow, was
placed in the order Galliformes
which includes pheasants, chickens
and other birds with heavy bodies.
However, a group of scientists
led by S Blair Hedges of Pennsylvania State University, US, has provided the first significant genetic
evidence that the bird is more
closely related to the cuckoo. A proposal has naturally followed to
move this bird to the cuckoo's
order, the Cuculiformes (Science,
Vo1270, No 5243).
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