February 2011 – vol. 104, issue 2, pp 94–99 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... This article is only available to registered users.To read more, please log in or purchase a subscription.