Smythies (1960:217) lists no record for North Borneo.
Sterna bergii Lichtenstein: Greater Crested Tern.—Specimens, 2: Kuala Sumawang: ♀, September 18, 1963, ADG 278; ♂, September 18, 1963, ADG 279.
This tern was observed several times off the coast of North Borneo near Tawau.
Treron curvirostra curvirostra (Gmelin): Thick-billed Pigeon.—Specimens, 9: Cocoa Research Station: ♂ testis 9 × 5 mm., 166.7 gm., August 1, 1962, MCT 2693; ♂ testis 5 × 4 mm., 167.2 gm., August 1, 1962, MCT 2694; ♂ testis 13 × 6 mm., 167.8 gm., August 1, 1962, MCT 2695; ♂ testis 9 × 5 mm., 155.5 gm., August 1, 1962, MCT 2700; ♀, 112.9 gm., August 2, 1962, MCT 2712; ♂, 185.8 gm., August 2, 1962, MCT 2713; ♀, 135.4 gm., growing new 5th primary, August 25, 1962, MCT 2806; ♀, 132.2 gm., August 31, 1962, MCT 2842; ♂, 112.5 gm., August 31, 1962, MCT 2843.
This pigeon was the most common bird eating wild figs (Ficus) in the communal feeding trees, where there were as many as 30 gathered in one tree to feed. While resting, individual birds commonly dipped their tails.
Treron olax olax (Temminck): Little Green Pigeon.—Specimens, 2: Cocoa Research Station: ♂ testis 11 × 5 mm., September 1, 1962, MCT 2844. Pintasan Agriculture Station: ♂, October 14, 1963, ADG 306.
The species was seen only once. At the Cocoa Research Station, one bird sat on a dead tree and fed on a red berry from a vine. The call resembled the crying of a child. Others called in the cocoa. The bird taken had testes of a size indicating possible breeding condition.
Treron vernans purpurea (Gmelin): Pink-necked Green Pigeon.—Specimens, 10: Tiger Estate: ♂, November 25, 1962, MCT 3323; ♀, November 25, 1962, MCT 3325. Telipok: ♀, January 31, 1963, TM 22; ♀, January 31, 1963, TM 20; ♂, January 31, 1963, TM 19; ♀, January 31, 1963, TM 21; ♂, February 10, 1963, TM 35; ♂, February 2, 1963, TM 25. Mt. Rumas: ♀, March 6, 1963, ADG 11. Tuaran: ♀, November 29, 1963, SCFC 34.
The species was confined to the lowlands around Tawau, as at the Tawau Airport in the scrub growth. Flocks of 50 to 100 were observed at Tuaran. None of the specimens taken in November was in breeding condition.
Ducula bicolor (Scopoli): Pied Imperial Pigeon.—I observed this pigeon on September 18 and 19 at Siamil Island. On the first day two were seen in the few remaining trees on the island and on September 19 a flock of 12 flew southwest over the island at about 8:30 A. M.