{"fact":"A simple behavior, ripping strips from pandanus leaves, may have been the starting point for the New Caledonian crow's remarkable tool-making abilities.","context":"A plausible behavioural precursor to the manufacture of pandanus tools is the leaf ripping that crows carry out in pandanus trees...This ripping may have led to crows removing strips for use as tools.","source":"Gavin R. Hunt; Russell D. Gray, Diversification and cumulative evolution in New Caledonian crow tool manufacture, 10.1098/rspb.2002.2302","index":588}