Calao rhinocéros Buceros rhinoceros

Majestic and stately inhabitant of mature lowland and foothill forests. Pitch black with a white tail marked by a single dark bar. Enormous bill is bright orange with a prominent casque that is short and rectangular in females, long and upswept in males. Often seen in powerful flight over forests, typically in pairs or small groups. Gives low, resonant calls, usually in series: either a single-syllabled “rohh” or a disyllabic “roh-ow.”