Aceros is a genus of Asian hornbills (family Bucerotidae).
Bucerotiformes, Bucerotidae, Buceros: Latin bucerus horned like an ox (Greek boukeros: horned like an ox: bous ox; keros: horn).
Aceros: Greek akeros: hornless.
1/ Rufous-necked hornbill (Niệc cổ hung, Aceros nipalensis)