Almost 90% of the world population breeds in Spain, above all in the Ebro delta.
From Audouin's Gull
It is a gull all but endemic to the Mediterranean, far scarcer than other gulls, and depends heavily on colonies concentrated on a handful of islands and deltas.
From Audouin's Gull
It went from fewer than a thousand pairs in the 1960s to more than twenty thousand, and Spain came to hold 90% of the world population: it is one of the greatest recoveries of a seabird in Europe.
From Audouin's Gull
The commonest large gull on the Spanish coast; it now breeds on the rooftops of many cities.
From Yellow-legged Gull
It is a case of a native species turned problem: its population explosion, fed by landfill sites and fishery discards, has made it a predator threatening colonies of storm petrels, shearwaters and terns on islets throughout the Mediterranean.
From Yellow-legged Gull
It breeds on the rooftops of Spanish coastal cities and defends the nest by attacking residents who come out onto the roof terrace, which causes recurrent conflict in Barcelona, Valencia and Cádiz.
From Yellow-legged Gull
Chicks learn to associate the red spot on an adult's bill with the cue to beg for food, a behaviour extensively studied in ethology.
From Herring Gull
It eats fish, marine invertebrates, eggs, carrion and human refuse.
From Herring Gull

Ecosystems