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Dark Hawk-Cuckoo - BirdForum Opus

Hierococcyx bocki

Identification

38-40 cm.

  • Brown above with narrow rufous bars
  • Ashy-grey crown, nape and neck
  • Brownish grey and black barred tail
  • Black chin, white throat and rufous breast, breast sometimes dark-streaked
  • White belly with blackish bars
  • Yellow eye-ring

Juveniles have barred rufous and brown upperparts, a grey forehead, a white nape, a rufous and black barred tail and have buff underparts streaked with black teardrops.

Similar species

Large Hawk-Cuckoo is slightly larger, has a streaked throat and breast and no rufous bars on upperparts.

Distribution

Breeds in the mountains of Borneo, Sumatra and Malaysia.
Common to fairly common in its range, scarce in Sumatra.

Taxonomy

This is a monotypic species.
Formerly considered conspecific with Large Hawk-Cuckoo.

Habitat

Found in deciduous and evergreen forests and open forest. On passage and in winter also in mangroves and gardens.
Occurs at 900-1600m in Sumatra and above 1000m in Borneo.

Behaviour

Diet

Feeds on insects, mainly caterpillars. Takes also berries.
Forages in the canopy, mainly solitary.

Breeding

A brood parasitic. Known host species are Laughingthrushes, Streaked Spiderhunter, Lesser Shortwing and Chestnut-capped Laughingthrush. Places one egg in hosts nest.

Movements

A resident species..

References

  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, B.L. Sullivan, C. L. Wood, and D. Roberson. 2012. The eBird/Clements Checklist of Birds of the World. 6th ed., with updates to October 2012. Ithaca: Cornell Univ. Press. ISBN 978-0801445019. Spreadsheet available at http://www.birds.cornell.edu/clementschecklist/downloadable-clements-checklist
  2. Del Hoyo, J, A Elliot, and J Sargatal, eds. 1997. Handbook of the Birds of the World. Volume 4: Sandgrouse to Cuckoos. Barcelona: Lynx Edicions. ISBN 978-8487334221

Recommended Citation

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