WTF do they think happens every single day? Something eats something else. Some animals are hunters, others are prey. IN this case, I think it was a dead squirrel and a gull eating carrion. But whatever. This is the way of the world. Some things eat plankton and tiny bugs. Something eats those critters. Something bigger eats those. Other things eat plants, then become food themselves.
If animal activists are shocked then they simply haven’t been paying attention.