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Which single species belongs to the family Opisthocomidae?
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Cuculiform
Body plans of representative Cuculiformes.
The single species that belongs to the family Opisthocomidae is the hoatzin (Opisthocomus hoazin).12
While some authorities have historically associated the hoatzin with the order Cuculiformes, it is distinct from other members of that order due to its unique foot structure and internal anatomy. Because of these differences, many scientists classify the hoatzin in its own order, Opisthocomiformes, rather than within the cuckoo order.1