Often in mixed colony, the Black-headed and Mediterranean Gulls appreciate the tranquility of the islets and their low vegetation to nest.
But how can we tell them apart ? The Black-headed Gull, the most common of the two species, is present all year round in Ile-de-France, while the Black-headed Gull can only be observed in the summer in our region. In the nuptial period, the first with chocolate-coloured head and brown beak while the second with black head and red beak. To identify them in flight, you have to be attentive to the colour of the wings. The Black-headed Gull has the underside of the dark wings, while the Black-headed Gull has white wings with a slight black leading edge.