www.gull-research.org

Being aware of the difficulties in identifying A. Herring and E. Herring, these small examples (1 cycles), will newertheless give a good hint of some of the differences that usually do exist. Hans argentatus are from southern Sweden and taken in the same month as Andrew's, which are from Massachusetts.
Also some fine pic. by Mårten Muller

http://www.pbase.com/gwwarbler/herg

http://www.pbase.com/hans_larsson/argen ... 1&page=all

http://www.pbase.com/hans_larsson/argen ... 2&page=all

http://www.pbase.com/m_muller/larus_argentatus_1cy

http://www.pbase.com/m_muller/larus_argentatus_2cy

Some others here:

http://www.htc.net/~kdan/gull2.htm

Jan