Mixed gulls

It’s not uncommon to see a single black-backed gull hanging around with a group of red-billed gulls. The relationship looks like an uneasy one, perhaps because black-backed gulls will prey on the chicks of red-billed gulls. These adult red-billeds are a bit big for even the most ambitious of predatory black-backed gulls, but should some food be found, the black-backed gull has no qualms about harassing the smaller birds out of their share.