European herring gull
The male European herring gull is long and weighs , while the female is and weighs . The wingspan can range from . Among standard measurements, the wing chord is , the bill is and the tarsus is . Adults in breeding plumage have a grey back and upper wings and white head and underparts. The wingtips are black with white spots known as "mirrors". The bill is yellow with a red spot and a ring of bare yellow skin is seen around the pale eye. The legs are normally pink at all ages, but can be yellowish, particularly in the Baltic population, which was formerly regarded as a separate subspecies "L. a. omissus". Non-breeding adults have brown streaks on their heads and necks. Male and female plumage are identical at all stages of development, but adult males are often larger.