One of the most likely forms of avian play involves a bird carrying an object into the air to repeatedly drop and catch it in flight. With some variations, drop-catch behaviour has been observed in raptors, gulls, corvids and possibly hirundines (Ficken 1977). Observations of drop-catch behaviour in Black-headed Chroicocephalus ridibundus, Lesser Black-backed Larus fuscus and Herring Gulls L. a...

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