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The '''hoatzin''' (''Opisthocomus hoatzin'') is a South American bird whose chief characteristic is a pair of claws on each wing when young. The development of this feature cannot be explained by the [[Theory of Evolution]].
The '''hoatzin''' (''Opisthocomus hoatzin'') is a South American bird whose chief characteristic is a pair of claws on each wing when young. The development of this feature cannot be explained by the [[Theory of Evolution]], as it would represent an inexplicable step backwards in the evolutionary path.
==Description==
==Description==