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  1. pdwinter

    Unusual black-headed gull, Ireland (North East coast)

    There's a thread at Black-headed Gulls with gray hind neck -www.gull-research.org
  2. pdwinter

    Unusual black-headed gull, Ireland (North East coast)

    leifvester Do you have BWP (Cramp and Simmons) ? Vol 3 (Waders to Gulls) has a lot of information with references to original articles. Unfortunately I gave my 6 volume set to a friend as I ran out of shelf space but it might be worth finding a public library to have a look through it. There...
  3. pdwinter

    Unusual black-headed gull, Ireland (North East coast)

    Probably because the breeding ranges of Bonaparte's and Black-headed don't overlap whereas there are mixed breeding colonies of BH, Med and Common Gulls in europe.
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