Medium-size, 3-cycle gull with sloping head ... note the California’s medium gray back; dark brownish greater coverts (pale gray on the ring-billed); and paler legs, often with a greenish ...

Juvenile and first-winter herrings are extremely variable, but not like any other regular large gull in the East. Main problem in the west is separation of small female herrings from dark Thayer ...

Understanding how gulls optimise navigation in urban airscapes could provide insight for path planning in UAV technology. In this project urban nesting Lesser Black-backed gulls have been fitted with ...