The great hornbill is a large bird, 95–130 cm 37–51 in long, with a 152 cm 60 in wingspan and a weight of 2 to 4 kg 4.4 to 8.8 lb. The average weight of 7 males is 3 kg 6.6 lb whereas that of 3 females is 2.59 kg 5.7 lb. It is the heaviest, but not the longest, Asian hornbill. Females are smaller than males and have bluish-white instead of red eyes, although the orbital skin is pinkish. Like other hornbills, they have prominent `eyelashes`. The most prominent feature of the hornbill is the bright yellow and black casque on top of its massive bill. The casque appears U-shaped when viewed from the front, and the top is concave, with two ridges along the sides that form points in the front, whence the Latin species epithet bicornis two-horned. The back of the casque is reddish in females, while the underside of the front and back of the casque is black in males

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