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Measurement of bill length.

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posted on 16.12.2014, 02:48 by Pär Söderquist, Joanna Norrström, Johan Elmberg, Matthieu Guillemain, Gunnar Gunnarsson

Bill length was measured (to nearest 0.01 millimeter) along the dorsal side of the maxilla using a caliper. Photograph: Pär Söderquist.

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