Breeding biology of black and red broadbill Cymbirhynchus macrorhynchos
1998
Siriporn Thong-aree (Royal Forest Dept., Bangkok (Thailand). Forest Research Office. Wildlife Research Div.)
Research into the breeding biology of the Black and Red Broadbill, Cymbirhynchus macrorhynchos was conducted from January 1996 through February 1997 at Pa Phru Toa Daeng, Narathivat Province. Seven, two kilometer routes in peat swamp forest, Melaleuca forest and along riverine habitat were surveyed in order to find nests, and to determine the breeding season. The Black and Red Broadbill has a breeding period from March to June. Sixty eight percent of nest were constructed over canals and thirty three percent suspended over paths. The nest was a bulky, untidy ball hanging from the tip of a branch of stick with an average height of 1.39 m above the water surface. The average total length of the nest was 38.7 cm with an average lateral entrance of 5*6.1 cm (N = 16). The egg was of a broad short shape with average size of 19.63*26.44 mm (N=15). Eggs were laid at the rate of one per day. The incubation period was 21 days. The young on hatching stage was altricial. The birds spent about 17 days caring for their young in the nest. Both sexes took parts in building the nest, incubation and feeding the young. Forest fire, predators and human disturbance were threats to the young.
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