ON THE STIMULUS SITUATION RELEASING THE BEGGING RESPONSE IN THE NEWLY HATCHED HERRING GULL CHICK (LARUS ARGENTATUS ARGENTATUS PONT.) by N. TINBERGEN and A. C. PERDECK (Dept. of Zoology, University, (Zoological Laboratory, University, Oxford) Leiden) (With 34 figures and 5 plates) (Rec. 15-II-1950) INTRODUCTORY A Herring Gull feeds its young in the following way. Stretching its neck downward, it utters a long-drawn call (the mew call, STRONG 1914; J Plate 1), then, if one cr more chicks respond, it regurgitates half digested food, of which, after dropping it, it takes a small morsel between the bill tips. This it presents to the young, standing quietly, head pointing down- ward, for several seconds. The chick responds by pecking at the bill tip. Its m'ovements are relatively clumsly and ill directed on the first day, and it may have to try many times before it gets hold of the food. The begging of the chick is not dependent on preceding regurgitation; the parent may take the initiative and regurgitate without being enticed to do so by the young, but usually the young will be the initiator. The chick will not always peck at the bill tip; it often pecks at
Behaviour – Brill
Published: Jan 1, 1951
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