the king of gulls - the largest gull in the world. not a herring gull. not a lesser black-backed gull. yes, they are opportunistic feeders - like most gulls - but they are also very highly predatory throughout their 25 years of life, which is not typical gull behavior. they tend to behave more like a raptor at times, killing anything smaller than them to eat. they eat fish. they eat chicks of other birds. they eat puffins and ducks and terns. they eat babies.