Berenicornis comatus (Raffles): White-crested Hornbill.—A pair was seen feeding about 150 feet up in a tree at the Cocoa Research Station. No other was seen in northern Borneo.
Annorrhinus galeritus (Temminck): Bushy-crested Hornbill.—This hornbill was seen only on October 3, 1962, at the Cocoa Research Station, when a flock of five flew overhead.
Aceros leucocephalus (Vieillot): Wrinkled Hornbill.—On October 3, 1962, a pair was seen in the primary forest at the Cocoa Research Station.
Aceros undulatus undulatus (Shaw): Wreathed Hornbill.—Specimens, 2: Cocoa Research Station: ♀ largest ovum 5 mm., October 2, 1962, MCT 2981; ♂ testis 10 × 11 mm., October 2, 1962, MCT 2982.
This, the most common hornbill at Quoin Hill and at Kalabakan, occurred in primary forest.
Anthracoceros malayanus (Raffles): Black Hornbill.—A flock of five was seen at the Cocoa Research Station rest house on September 6 and 13, 1962.
Buceros rhinoceros Linnaeus: Rhinoceros Hornbill.—It was fairly common at the Cocoa Research Station, where several were observed in July and August.
Rhinoplax vigil (Forster): Helmeted Hornbill.—The Helmeted Hornbill was rarely observed, but almost every day we heard its call when we were on the east coast. It was also heard in the forest on the west coast around Tenom, but is not common there owing to hunting by the natives. Skulls of this and the preceding species were on sale in a shop at Tenom, despite laws prohibiting the killing of these species.
Calorhamphus fuliginosus tertius Chasen and Kloss: Brown Barbet.—Specimens, 7: Cocoa Research Station: ♀ largest ovum 2 mm., 38.8 gm., brood patch, July 7, 1962, MCT 2610; ♀, 40.0 gm., August 1, 1962, MCT 2702; ♀, 44.8 gm., August 1, 1962, MCT 2703; ♂ testis 5 × 3 mm., September 25, 1962 (paired with MCT 2956), MCT 2955; ♀, September 1, 1962, MCT 2846, ♀, September 25, 1962, MCT 2956; ♀?, November 30, 1962, MCT 3436.
These barbets were common at the Cocoa Research Station both in secondary forest and cocoa, usually in groups of three or four. They were seen also at Kalabakan where the birds fed in the top of a 100-foot tree in the primary forest.
In describing this bird, Smythies (1960:322) said the male's bill is black. The one male that I took had an orange bill and at no time did I observe any black-billed birds at the Cocoa Research Station; this black bill perhaps is a character of the subspecies C. f. fuliginosus.