In order to successfully hunt aggressive army ants West African chimpanzees will search far and wide to find the perfect tools.
The Alchornea hirtella plant is what they are looking for as this provides the two tools required for the job; a thicker shoot for 'digging' and a more slender tool for 'dipping'. If Alchornea hirtella is nowhere to be found, chimps will fashion tools from other plants -- but seemingly only after an exhaustive search for their preferred tool provider.
Once the chimps have located an army ant colony, they will dig into the nest with the first tool to aggravate the insects. They then dip the second tool into the nest, causing the angry ants to swarm up it. Once the slender shoot is covered in ants, the chimpanzees pull scoop up a substantial handful from the shoot to eat.
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