One of the most powerful predators on the coast and lower river is the Black - back gull.
These birds will take any prey they fancy, including ducks, rabbits and fish. They are one bird that all others recognise as an apex predator on the riverside.
They will also take carrion and any opportunity to steal food from other lesser gulls and Crows.
Their size compared to our regular herring gull and Hoodie Crow can clearly be seen in the photos.
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