The Lava gull (Leucophaeus fulginosus), is a gull. One of the rarest gulls in the world, the entire population lives on the Galápagos Islands and is estimated at 300–400 pairs. The adult plumage, acquired in the third year of life, consists of a black head, black wings, and with a dark gray body and a paler gray belly. The bill and legs are black, and the inside of the mouth is scarlet. They have white upper and lower eyebrows, with red lids. Immature gulls are generally dark brown.