Figure 2. Comparison of shape and body proportions of Wilsons' (top left), Band-rumped (bottom left), and Leach's (front) Storm-Petrels. Note shape of wings and relative size of bill. The feet of Wilson's extend beyond the tail. Note also the shape of the tail: rounded or square in Wilson's and Band-rumped, forked in Leach's. The rump patch of Leach's is broken or has a dividing line (most prominent at the tail end).
by Donna L. Dittmann
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