The male and female seagulls’ differences are not easily distinguished by the naked eye. The only significant distinction is that male seagulls typically have brighter plumage than females. However, because this difference is so slight, humans frequently miss it.
Seagulls can distinguish between male and female birds even if it is difficult for people to see the difference. Seagulls are more color-sensitive than humans, who only have three cones in their eyes to distinguish between red, green, and blue.
The seagull’s eye, in comparison, has four cones. Seagulls can perceive infrared colour, which is invisible to humans, thanks to their fourth cone. Due to this distinction, the male seagulls appear to be much brighter than the female seagulls, who appear to be more subdued.
The species of birds with the greatest colour variety are those in which only the female is responsible for raising the young. In those circumstances, the male birds’ brighter plumage helps draw predators to them, keeping them away from the female and her young. Seagulls are excellent parents, though. Male and female seagulls form lifelong pairs, and they alternate incubating the eggs and caring for the young once they hatch.