Great Hornbill Identification Guide

Key Field Marks

• Size & shape: Very large, 95–130 cm (37–51 in) long including a long tail, with broad, deep wingbeats that produce a loud whooshing sound audible well before the bird comes into view.
• Bill & casque: Massive yellow bill topped by a prominent, hollow, U-shaped or concave-topped casque, often stained yellow-orange from preen-gland oil; casque size and shape differ slightly between the sexes.
• Plumage: Body mostly black with a white neck, white lower belly and thighs, and a black band across an otherwise white tail; wings show a broad white trailing edge visible in flight.
• Eyes: Males have red eyes with red orbital skin; females have whitish eyes with pink-red orbital skin — a useful way to sex the species at close range.
• Behavior: Primarily frugivorous (figs are a key food) but also takes small animals; forages in the canopy in pairs or small family groups; nests in large tree cavities, where the female seals herself in with mud and droppings, leaving only a narrow slit through which the male passes food.

Separating Great Hornbill from Similar Species

• Rhinoceros Hornbill (Southeast Asian islands, limited range overlap): Casque curves upward at the front rather than sitting flat/concave, and is often more reddish.
• Malabar Pied Hornbill: Considerably smaller, with a more slender bill and a differently shaped, smaller casque, and more extensive white in the plumage.
• Wreathed Hornbill: Lacks the tall casque, instead showing a series of low ridges, and has a pouch of bare throat skin (blue in females, yellow in males).

Where & When to See One

Great Hornbills inhabit dense evergreen and moist deciduous forests of the Indian subcontinent and Southeast Asia, from the Western Ghats and Himalayan foothills of India through Southeast Asia to Sumatra. They are resident year-round but make local seasonal movements tracking fruiting fig trees. Best located by listening for their loud wingbeats and far-carrying calls, then scanning fruiting canopy trees.

Voice

Loud, deep, barking or roaring calls, often described as a series of grunts building to a loud "kroh" or roar; pairs sometimes call in duet, and the sound carries long distances through the forest.