Abstract
Gull chicks (Larus atricilla) peck at their parent's red bill, an act which elicits regurgitation from the parent. In an investigation reported elsewhere1, it was found that chicks peck preferentially in response to long and short wave-lengths of visible light (that is, they prefer red and blue to green and yellow). The following hypothesis attempts to account for this wave-length preference.
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HAILMAN, J. Coding of the Colour Preference of the Gull Chick. Nature 204, 710 (1964). https://doi.org/10.1038/204710a0
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DOI: https://doi.org/10.1038/204710a0
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