The combination of a small and fragmented range, plus continuing habitat loss, qualify this species as Vulnerable. However, knowledge is poor and new information may result in a reclassification to a higher or lower threat category.
AOU. 1998. Check-list of North American birds. American Ornithologists' Union, Washington, D.C.
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.
Stotz, D. F.; Fitzpatrick, J. W.; Parker, T. A.; Moskovits, D. K. 1996. Neotropical birds: ecology and conservation. University of Chicago Press, Chicago.
10 cm. Medium-sized, mainly green hummingbird with black wings. Male has iridescent blue forehead and bluish-green hindcrown, iridescent emerald throat and slightly forked, bluish-black tail. Female green above with small, white postocular spot, greyish below with green discs on flanks. Bluish-black tail with white tips to outer rectrices and green central rectrices. Straight black bill. Immature unknown. Similar spp. Male Broad-billed Hummingbird Cynanthus latirostris has red bill, blue throat and lacks blue crown, female has dusky red bill and noticeable white postocular stripe. Berylline Hummingbird Amazilia beryllina is pale below with rufous tail and wing-patch. Voice Fluid rattling notes and trills.
Collar, N. J.; Gonzaga, L. P.; Krabbe, N.; Madroño Nieto, A.; Naranjo, L. G.; Parker, T. A.; Wege, D. C. 1992. Threatened birds of the Americas: the ICBP/IUCN Red Data Book. International Council for Bird Preservation, Cambridge, U.K.
Howell, S. N. G.; Webb, S. 1995. A guide to the birds of Mexico and northern Central America. Oxford University Press, Oxford.
Wege, D. C.; Long, A. J. 1995. Key Areas for threatened birds in the Neotropics. BirdLife International, Cambridge, U.K.
Further web sources of information
Detailed species account from the Threatened birds of the Americas: the BirdLife International Red Data Book (BirdLife International 1992). Please note, taxonomic treatment and IUCN Red List category may have changed since publication.
Text account compilers
Benstead, P., Capper, D., Isherwood, I., Sharpe, C J, Taylor, J.
IUCN Red List evaluators
Butchart, S., Symes, A.
BirdLife International (2014) Species factsheet: Thalurania ridgwayi. Downloaded from http://www.birdlife.org on 11/03/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 11/03/2014.
This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.
To provide new information to update this factsheet or to correct any errors, please email BirdLife
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|Current IUCN Red List category||Vulnerable|
|Species name author||Nelson, 1900|
|Population size||6000-15000 mature individuals|
|Distribution size (breeding/resident)||14,500 km2|
|Links to further information|
|- Additional Information on this species|