Ann & Steve Toon / Southern redbilled hornbill (Tockus rufirostris), Zimanga game reserve, South Africa.

Staffan Widstrand / Wild Wonders of China / Wreathed hornbill (Rhyticeros undulatus) Tongbiguan Nature Reserve, Dehong, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Wreathed hornbill (Rhyticeros undulatus) Tongbiguan Nature Reserve, Dehong, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Wreathed hornbill (Rhyticeros undulatus) flying to tree, Tongbiguan Nature Reserve, Dehong, Yunnan, China

Staffan Widstrand / Wild Wonders of China / Wreathed hornbill (Rhyticeros undulatus) Tongbiguan Nature Reserve, Dehong, Yunnan, China

Sandesh Kadur / Wreathed hornbill (Rhyticeros / Aceros undulatus), Assam, India. Vulnerable species.

Sandesh Kadur / Wreathed hornbill (Rhyticeros / Aceros undulatus), Assam, India. Vulnerable species.

Ernie Janes / Trumpeter hornbill (Bycanistes bucinator) feeding, captive.

Ernie Janes / Trumpeter hornbill (Bycanistes bucinator) feeding, captive.

Staffan Widstrand / Southern Yellow-billed Hornbill, (Tockus leucomelas) tossing a fly larva at a carrion site, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Southern Yellow-billed Hornbill, (Tockus leucomelas), eating fly larvae at a carrion site, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Sandesh Kadur / Great Indian Hornbill (Buceros bicornis) flying in forest habitat, Tamil Nadu, Western Ghats, India