The Kittiwake gull (Rissa tridactyla) is a sea-gull characterized by the absence of the hind toe. It is resident on both sides of the N. Atlantic, and breeds in large colonies where sea-cliffs provide it with ledges of rock. It measures fifteen inches in length, and in summer is white below, with black tips to some of its wing primaries. The legs are black, a distinction from the related R. brevirostris of the N. Pacific, which has orange legs and feet.
John H. Finley ed. Nelson's Perpetual Loose-Leaf Encyclopaedia (vol. 7) (New York, NY: Thomas Nelson and Sons, 1917) 129