Figure 3. Actual wing tracings of Band-rumped (top), Leach's (middle), and Wilson's (bottom) Storm-Petrels. The width (A) of the wing across the secondaries is broadest in Leach's. The actual length of the wing [measured as wing chord (B)] is fairly similar between the three species. Whereas, the "wing" (C) is proportionately longer in Band-rumped and Leach's due to the longer forearm (D).

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