Caption
France, Somme, Baie de Somme, Le Crotoy, The marsh of Crotoy welcomes each year a colony of Black-headed Gull (Chroicocephalus ridibundus - Black-headed Gull) which come to nest and reproduce on islands in the middle of the ponds, seagulls then chase materials for the construction of nests
Availability
Only inAustralia, Canada, Ireland, Italy, Netherlands, New Zealand, Spain, United Kingdom, United States