- Cercococcyx olivinus
- Dark olive-brown upperparts
- Greyish crown
- Often unbarred remiges and coverts
- Long tail with broad rectrices, tipped white or pale rufous
- Whitish underparts with black barring
- Greenish yellow eye-ring and skin around eye
Sexes similar. Juveniles are tawny with rufous feather tips above, have a pale throat, are streaked below and have pointed rectrices.
Found mainly in unbroken mature forest. Also in secondary growth and gallery forest.
A shy and secretive species, often only noticed when calling.
Feeds on insects, mainly hairy caterpillars. Often in mixed-species flocks in middle and upper strata of forest.
A resident species.
An emphatic three-note call, faling in pitch.
- 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
- 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
- BirdForum Opus contributors. (2021) Olive Long-tailed Cuckoo. In: BirdForum, the forum for wild birds and birding. Retrieved 17 April 2021 from https://www.birdforum.net/wiki/Olive_Long-tailed_Cuckoo