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Comparison of wing shape of selected WPD birds in dorsal view: a, Catharus guttatus (Turdidae, Hermit Thrush; PSM 11204); b, Cinclus mexicanus (Cinclidae, American Dipper; USNM 640895); c, Aethia pusilla (Alcidae, Least Auklet; UWBM 48412); d, Pelecanoides urinatrix (Pelecanoididae, Common Diving Petrel; PSM 17233). Scale bars = 1 cm
