
%0 Journal Article
%A Aumann, T 
%T Use of Stones by the Black-Breasted Buzzard <I>Hamirostra melanosternon</I> to Gain Access to Egg Contents for Food
%J Emu
%D 1990/09/01
%V 90
%N 3
%P 141-144
%K 
%R https://doi.org/10.1071/MU9900141
%U https://www.publish.csiro.au/paper/MU9900141 
%X A captive Black-breasted Buzzard Hamirostra melanostemon cracked Domestic Chicken Gallus gallus eggs by using its bill to throw 15-65 g rounded stones at them in order to feed on the contents. The throwing method, feeding and post-feeding behaviour are described. Throwing accuracy improved during a series of trials conducted over 26 days. The egg-breaking activity is discussed in terms of tool usage and in terms of learned versus non-learned behaviour. 
