Children (19 direct children, 209 direct and indirect children):
Aceros
(tree size 20)
Anthracoceros
(tree size 8)
Penelopides
(tree size 17)
Tockus
(tree size 34)
Ceratogymna
(tree size 5)
Anorrhinus
(tree size 3)
Buceros
(tree size 27)
Bycanistes
(tree size 15)
Rhyticeros
(tree size 13)
Berenicornis
(tree size 2)
Bucerotinae
(tree size 4)
Tropicranus
(tree size 3)
Rhinoplax
(tree size 1)
Lophoceros
(tree size 17)
Rhabdotorrhinus
(tree size 8)
Horizocerus
(tree size 9)
Rhynchaceros
(tree size 1)
Annorhinus
(tree size 3)
Bucorvinae