A possible acoustic function for the casque structure in hornbills (Bucerotidae).    From Wordnik.com.  [Bucorvids: post-Cretaceous maniraptorans on the savannah] Reference

Guinea-fowl (Numididae), bustards (Otididae), hornbills (Bucerotidae) and francolins Francolinus sp. are found throughout the park, and raptors such as vultures (Accipitridae), fish eagle Haliaeetus vocifer, martial eagle Polemaetus bellicosus, and Gobar goshawk Melieraz gabar are also common.    From Wordnik.com.  ['W' National Park, Niger] Reference

Family Bucerotidae (Hornbills).    From Wordnik.com.  [Bucorvids: post-Cretaceous maniraptorans on the savannah] Reference

| 1863 | Intellectual | The Bucerotidae, or Hornbills.    From Wordnik.com.  [Alfred Russel Wallace Letters and Reminiscences]