The Mysterious Tool-Making Culture Shared by Crows and Humans
Crows aren’t born knowing how to make these tools; they teach the technique to their young. And they can improvise, too. In one lab experiment, a crow bent the end of a wire using the edge of a glass as a cantilever. It used the hooked wire to retreive another stick, which was long enough to reach some food it wanted. So it used one tool to make another tool — and then used that tool to grab still another tool.
via http://io9.gizmodo.com/the-mysterious-tool-making-culture-shared-by-crows-and–1460350033