|Continental Cormorant Phalacrocorax carbo sinensis|
The most detailed analysis on the subject was published back in 2004 (Sub-Specific Differentiation & Distribution of Great Cormorants in Europe Stuart E. Newson et al). The study concluded that a bird with a gular patch angle <65 degrees was likely to be P c carbo and those with an angle > 73 degrees was probably sinensis.
The bird photographed today at Ogston looks to have an angle of 90 degrees and is probably therefore the continental race sinensis
|Comparison of gulag patch angle in P c carbo and P c sinensis|
|Cormorant P c carbo|