
TY  - JOUR
A1  - Aumann, T 
T1  - Use of Stones by the Black-Breasted Buzzard <I>Hamirostra melanosternon</I> to Gain Access to Egg Contents for Food
JF  - Emu
JO  - EMU
Y1  - 1990
VL  - 90
IS  - 3
SP  - 141
EP  - 144
KW  - 
UR  - https://doi.org/10.1071/MU9900141 
N2  - 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. 
ER  -

