Parent: Bucerotidae (Hornbills)

└─ Aceros

└─── Aceros cassidix (Knobbed hornbill)

└─── Aceros corrugatus (Wrinkled hornbill)

└─── Aceros leucocephalus (Writhed hornbill)

└─── Aceros nipalensis (Rufous-necked hornbill)

└─── Aceros waldeni (Walden's hornbill)