{"fact":"The New Caledonian crow's tool designs haven't changed much over a decade, showing a remarkable consistency in their crafting skills.","context":"Furthermore, we have evidence for high similarity in the shapes of stepped tools over more than 10 years at Pic Ningua...Low coefficient of variation values for the three samples combined (CV for length = 14%; CV for steps = 19%) show that the shapes of these tools varied little over the 10.5 years.","source":"Gavin R. Hunt; Russell D. Gray, Diversification and cumulative evolution in New Caledonian crow tool manufacture, 10.1098/rspb.2002.2302","index":586}