{"fact":"New Caledonian crows can solve complex physical problems, sometimes even surpassing the abilities of great apes, by reasoning about cause-and-effect relationships.","context":"In the wild, New Caledonian crows, Corvus moneduloides, forage in holes for grubs and insects using a variety of tools with a level of sophistication sometimes surpassing that of the great apes...Experimental work has suggested that their tool skills may be based on complex physical cognition.","source":"A.H Taylor; G.R Hunt; F.S Medina; R.D Gray, Do New Caledonian crows solve physical problems through causal reasoning?, 10.1098/rspb.2008.1107","index":180}