Eric Walker added Opisthocomus hoazin to Opisthocomus, and added Opisthocomus to Opisthocomidae

Eric Walker added Opisthocomus to Opisthocomidae, and added Opisthocomidae to Opisthocomiformes

Eric Walker added Opisthocomidae to Opisthocomiformes, and added Opisthocomiformes to Aves