lalows2's picture

Sinensis?

Observed: 27th September 2011 By: lalows2lalows2’s reputation in Birdslalows2’s reputation in Birds
sideview2
sideview2 1
Description:

Is it possible to get juvenile cormorants to subspecies level?

Identifications
Species interactions

No interactions present.

Comments

RoyW's picture

Sub-species identification

Current thinking on the identification of carbo and sinensis Cormorants is that the angle made by the gape line and the rear edge of the gular pouch is the most reliable feature for use from photographs (if a photo showing the subject in profile can be taken).

If the angle is under 66 degrees carbo is the likely ID, if it is above 72 degrees then it is sinensis.
(There is overlap between 66-72 degrees).
The angle on the bird in your photo is about 90 degrees - which should make it sinensis.

See the pdf here:
http://www.avibirds.com/pdf/A/Aalscholver1.pdf

lalows2's picture

Paper

Thanks Roy - that was the paper I was trying to recall.

Cheers

D

The magic of nature is all around us - we just need to learn how to see it.
http://lalows.blogspot.com

DavidHowdon's picture

Sub-species ID

You can add the sub-species ID as a revision in iSpot if you want.