The Hoatzins (Opisthocomiformes) - Order
(Opisthocomidae) - family
(Foro)

(Foro )

()

()

()
(Hoatzi)

(Hoatzi )

()

()

()
(Hoatzinavis)

(Hoatzinavis )

()

()

()
(Hoatzinoides)

(Hoatzinoides )

()

()

()
(Namibiavis)

(Namibiavis )

()

()

()
(Onychopteryx)

(Onychopteryx )

()

()

()
(Opisthocomus)
Hoatzin
(Opisthocomus hoazin)
(Protoazin)

(Protoazin )

()

()

()