M. Gochfeld
W.I. Boarman
J. Burger
1988
<p>Young Common Terns (<i>Sterna hirundo</i>) did not respond preferentially to calls of siblings at 8 and 9 days of age, but did so by 12 days of age. In experiments with and without visual isolation, and with use of playback, we demonstrated a tendency to approach sibling begging calls. This differential response indicated sibling-recognition occurred, was based on experience, and involved vocal cues.</p>
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American Ornithological Society
Experimental evidence for sibling recognition in Common Terns (<i>Sterna hirundo</i>)
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