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Fingers are connected plavatelnoy membrane (Figure 1.1, 1.3). The front edge membrane can be more or less deeply cut, but the membrane between the middle and inner fingers never shorter than half the length of the internal finger (Fig. 1.2)


Fig. 1. Łapy lake gulls (1), krachki - swimming membrane deeply cut (2) and cormorant - all four fingers soedeniny membrane (3)

Solid film on the paws there, and if there is a membrane, it connects only the founding of the fingers, or each finger individually has a swimming blade. Sometimes fingers at some of coalesce with each other