How do Black-headed Gulls distinguish between eggs and egg-shells
01 March 1962
Main paper
{Lams ridibundus) remove the empty eggshell shortly after the hatching of the chick. An investigation into the survival value of this response and of the stimuli eliciting it (Tinbergen et al. 1962a) yielded the following results. An empty egg-shell at a ...
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