Incised Webbed Foot of a Tern

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“ or both webs may be so deeply incised, that is, cut away, that the palmation is practically reduced to semipalmation, as in terns of the genus Hydrochelidon.” Elliot Coues, 1884


Bird Anatomy


Elliot Coues Key to North American Birds (Boston, MA: Estes and Lauriat, 1884)


TIFF (full resolution)

2037×2400, 538.9 KiB

Large GIF

869×1024, 74.2 KiB

Medium GIF

543×640, 37.6 KiB

Small GIF

271×320, 14.5 KiB