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Area on the inner upperwing, often on median and longest lesser coverts, of contrasting colour (light on e.g. harriers, and petrels and darker on young small gulls[1].

References

  1. ^ Mullarney, Killian; Lars Svensson, Dan Zetterström and Peter J. Grant (1999). Birds of Europe. Princeton University Press. ISBN 0691050538.  Cite uses deprecated parameter |coauthor= (help)


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