Breeding biology of swiftlet in Penang Malaysia

A colony of the Edible-nest Swiftlet Aerodramus fuciphagus nesting in a Chinese shophouse in Penang, Peninsular Malaysia, was studied for seven months. Birds bred throughout, but laying was concentrated in the period October to February ( Keadaan sama seperti di pantai timur malaysia, kelantan, terengganu,Pahang dan juga utara malaysia ). Incubation and fledging periods were 23 ± 3 days and 43 + 6 days, respectively. Most young hatched during the dry season. The normal clutch size was two, with many birds laying second clutches (75%) and some third clutches (15-4%) using the same nest. Clutch size showed no variation with clutch order or month.

The overall hatching success was 69-0 %, most losses caused by eggs falling from or with the nest. Fledging success was similar for broods of two (625%) and broods of one (59-4%), so that the former were twice as productive. The main loss of chicks occurred when they fell from the nest and were eaten by mammalian predators. There was a tendency for breeding success to decline with  successive clutches, but not with month, being highest in November (53-6 %) and February (55-6 %).

Translator
1    Incubation.......  20 hingga 26 hari
2     clutches........           2 biji telor
3    fledging periods ( terbang meninggalkan sarang ).........   .            43 hingga 49 hari 
4. Kadar tetasan telor 69 peratus
5. kadar burung ulangi bertelor pada sarang sama   75%           .   kali kedua dan 15% untuk kali ke tiga.  
6 Brood ( Anak avian sehingga berbulu pelepah ) Kadar  hidup sama bagi tetasan 2 ekor atau 1 ekor