Family Old World Flycatchers and Chats (Muscicapidae)

Critically Endangered

Rück's Blue-flycatcher (Cyornis ruckii)


French: Gobemouche de Rück German: Oustaletblauschnäpper Spanish: Papamoscas de Rück

Siphia Ruckii


, 1881,

Malacca, Malaysia (presumably a trade import from Sumatra)


Species name often misspelt “ruecki”, based on an old but unjustified emendation; original spelling does not include umlaut of collector’s name. Monotypic.


Medan area#R, NE Sumatra. Not recorded since 1918#R.

Descriptive notes

17 cm. Large flycatcher. Male has crown and upperparts to neck side, lower back and upperwing-coverts dark blue, pale blue band across forehead and narrowly over eye; lores... read more




The two known specimens were in exploited or logged lowland forest at 150 m and 200m.

Food and feeding

No information.


An immature or juvenile specimen was collected at Delitua, N Sumatra in Apr.


Presumed to be resident; dates of specimens (in Jan and Apr), however, suggest possible migratory... read more

Status and conservation

CRITICALLY ENDANGERED. CITES II. Restricted-range species: present in North Sumatran Lowlands Secondary Area. Known only from four specimens. Two undated specimens from... read more

Recommended citation

Clement, P. & Sharpe, C.J. (2020). Rück's Blue-flycatcher (Cyornis ruckii). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 28 February 2020).