Gulls of the Northwest

Species	Age group	Length in inches	Mantle color*	Leg color	Bill	Eye	Head: breeding	Head: winter	Wingtips	Other
Bonaparte's	Adult	13.5000	3.0000	Pink/red	Black	Dark	Black	White, dark smudge behind eye	Black, narrow	White wedge on leading wing edge
Mew	Adult	16.0000	6.0000	Yellow	Yellow, plain, small	Dark	White	Streaked, brown, heavy	Black, extensive white
Black-legged Kittiwake	Adult	17.0000	6.5000	Black, short	Yellow, plain	Dark	White	White, dark smudge on back	Black
Ring-billed	Adult	17.5000	2.0000	Yellow	Yellow, black ring	Light	White	Streaked, brown	Black, little white
Heermann's	Adult	19.0000	8.0000	Black	Orange, black tip	Dark	White	Streaked , gray-brown
California	Adult	21.0000	6.0000	Yellow	Yellow, black and red dots	Dark	White	Streaked, brown, heavy	Black, some white
Thayer's	Adult	23.0000	3.0000	Pink	Yellow, red dot, slender	Dark	White	Streaked, light brown, heavy	Black, some white
Herring	Adult	25.0000	2.0000	Pink	Yellow, red dot	Light	White	Streaked, brown, heavy	Black
Slaty-backed	Adult	25.0000	8.5000	Pink	Yellow, red dot, slender	Light	White	Streaked, brown, light,semi-streak before and behind eye	Black, string of pearls
Western	Adult	25.0000	8.0000	Pink	Yellow, red dot, large	Dark	White	Streaked, brown, moderate	Black
Glaucous-winged	Adult	26.0000	5.0000	Pink	Yellow, red dot	Dark	White	Streaked, brown, moderate	Medium Gray
Glaucous-winged-Western Hybrid	Adult	26.0000	6.0000	Pink	Yellow, red dot	Dark	White	Streaked, brown, moderate	Dark Gray
Glaucous	Adult	27.0000	1.0000	Pink	Yellow, red dot	Light	White	Streaked, brown, light	White

*On a scale of 1 to 8.5 in which 1.0 is lightest and 8.5 is darkest