{"fact":"New Caledonian crows are master tool makers, crafting hooked tools from twigs by discarding one side of a forked twig and sculpting the other into a hook. They also create tools from Pandanus leaves, in three distinct designs: wide, narrow, and stepped.","context":"NC crows manufacture two types of tools (Hunt, 1996): stick tools (Hunt & Gray, 2002) and tools made from the barbed edges of Pandanus species leaves (Hunt & Gray, 2003, 2004b). Stick tools can be made by simple modifications to twigs and similar stick-like materials, or by a much more complicated process to create hooked tools from fresh twigs (Hunt, 1996; Hunt & Gray, 2004a). Pandanus tools are manufactured to three different designs: uniformly wide, uniformly narrow, and stepped or tapered (Hunt & Gray, 2003).","source":"J. C. Holzhaider; G. R. Hunt; R. D. Gray, Social learning in New Caledonian crows, 10.3758/lb.38.3.206","index":481}