Larus cachinnans(last update: |
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Coordinator: Greg Neubauer Marcin Przymencki Albert de Jong Mars Muusse cachinnans plumages |
From the Rarities Committee's files - Identification of Caspian Gull. Part 2: phenotypic variability and the field characteristics of hybrids, by Chris Gibbins, Grzegorz Neubauer and Brian Small, IN: BB 104/2011. Fig. 3. Measurements used to derive bill-length to depth and primary-projection ratios for the sample of first-winter birds. Bill ratio is calculated as L/D, primary projection as I/L (projection beyond tail/length beyond tertials). Both images show same juvenile Caspian Gull Larus cachinnans, August 23 2008, IJmuiden, the Netherlands. Picture: Mars Muusse. |