Ardea
Official journal of the Netherlands Ornithologists' Union

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Leadprathom K., Chimchome V. & Bumrungsri S. (2009) Nesting ecology of the Collared Scops Owl Otus lettia in Thailand. ARDEA 97 (4): 457-461
Information on the Collared Scops Owl Otus lettia in Thailand is extremely limited and this study examined its nesting ecology. From August 2006 September 2007, 23 nests were found and observed in Chanthaburi Province. The breeding season for the Collared Scops Owl started in early January and continued until the end of April. The majority of nest sites were a tree cavity with the opening facing skyward. The average nest height was 3.4 m (SD 1.7) from the ground; average size of the nest entrance was 16 (SD 6.1) cm 28 (SD 17.4) cm; cavity dimensions were 17 (SD 6.1) cm wide, 24 (SD 8.9) cm long, and depth was 24 (SD 28.5) cm. The average crown cover in the nest area was 43%. The majority of the land used around the nest site was agricultural land. The number of eggs laid per nest was 14, with a mode of three eggs, and the hatching rate was 60%. The average weight of hatched chicks was 13 (SD 1.6) g and the fledgling weight was 88 (SD 7.6) g. The nesting success was 52% (12 of 23 nests), the survival rate (to fledging) was 65% and mortality rate was inversely related to chick age.


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