It is a slender gull, smaller than the Yellow-legged and the Lesser-black-backed gulls. It displays a bright red beak with a vertical black stripe near the tip, the legs are grey and the eyes are dark. It is the most threatened gull of its genera, and considered very rare in Portugal until recent years. In Eastern Algarve, a nesting area has been recently identified in the Deserta island - Ria Formosa coastal lagoon. It is mostly observed in salt pans and sand banks and not so frequent on other biotopes of the Algarve coast. It occurs mostly around spring and fall.
For further information, please visit Atlas das Aves Marinhas de Portugal.