The Black-legged Kittiwake (Rissa tridactyla) is a seabird species in the gull family Laridae. This species was first described by Linnaeus in his Systema naturae in 1758 as Larus tridactylus. Rissa tridactyla pollicaris in the North Pacific Ocean, which (as the name pollex, thumb, suggests) has a normally developed hind toe.
The Black-legged Kittiwake (Rissa tridactyla) is a seabird species in the gull family Laridae. This species was first described by Linnaeus in his Systema naturae in 1758 as Larus tridactylus. Rissa tridactyla pollicaris in the North Pacific Ocean, which (as the name pollex, thumb, suggests) has a normally developed hind toe.