This story is a few years old but it came up on a PBS NOVA and seemed worth revisiting.
http://news.nationalgeographic.com/news/2002/08/0808_020808_crow.htmlBetty's toolmaking abilities came to light by accident during an experiment in which she and Abel had to choose between a hooked and a straight wire for retrieving small pieces of pig heart, their favorite food. When Abel made off with the hooked wire, Betty bent the straight wire into a hook and used the tool to lift a small bucket of food from a vertical pipe. This experiment was the first time the crows had been presented with wire.
The researchers then devised a new experiment to test Betty's startling behavior systematically. They placed one piece of straight garden wire on top of the tube and waited for either crow to try retrieving the food. In her ten successful retrievals, Betty bent the wire into a hook nine times. Abel retrieved the food once, without bending the wire.
Betty almost always tried to get the food with the straight wire first. She then made hooks of varying shapes by wedging one end of the wire into taped-up sections of the tube apparatus and tray, or by holding it in her feet, while pulling the other end with her bill. [continued]
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