Parent: Bucerotidae (Hornbills)

└─ Bycanistes

└─── Bycanistes brevis (Silvery-cheeked hornbill)

└─── Bycanistes bucinator (Trumpeter hornbill)

└─── Bycanistes cylindricus (Brown-cheeked hornbill)

└─── Bycanistes fistulator (Piping hornbill)

└─── Bycanistes subcylindricus (Grey-cheeked hornbill)