Wednesday, September 04, 2019

Charlestown canal

'British' Cormorant, P. c. carbo.
The rear edge of the bare yellow skin slopes forward below the gape.
(In 'Continental' Cormorant, P. c. sinensis, the rear edge drops vertically from the gape. See Helm Guide, p102.)


heavy birder said...

Which Helm guide???

Peter Smith said...

The Helm guide to bird identification. 2014. Vinicombe, Harris and Tucker