I don't think they are raptors. The head, beak and wing shape look similar to black back gulls, but it's difficult to tell from a photo and from underneath. Gulls don't like black backs. We get them, especially at lambing time. They are mean and nasty and I have seen a ewe give birth and before she got up a male blac k ba k was down and away with her lamb. I've also seen one attack a fox that was eating a rabbit. Black backs can get a wingspan of about 6 feet. They also take ducklings, young moorhens, oystercatcher chicks and teewits to name but a few. If you find out any thing different that doesn't come up on the Org, please let us know as it's interesting. Cheerio.
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