- A crested bird <em>(Opisthocomus hoazin)</em> of tropical South America having brown and buff plumage and a blue face. Juveniles have claws on the first and second digits of the wings.
- Same as <internalXref urlencoded="hoactzin">hoactzin</internalXref>.
- Same as <xref urlencoded="hoazin">hoazin</xref>.
- A <xref>bird</xref>, <xref>Opisthocomus hoazin</xref>, with <xref>claws</xref> on the wing fingers of the juvenile and an enlarged <xref>crop</xref> used as a <xref>rumen</xref>.
- crested ill-smelling South American bird whose young have claws on the first and second digits of the wings