Some chimps have modified the design of a fishing stick to make it into a better tool.
Congolese chimps modify fishing-sticks to make them even more effective tools
Nutcrackers & Whistles: Animals That Use Tools
Planning abilities of wild chimpanzees (Pan troglodytes troglodytes) in tool-using contexts
How Animals Actually Eat Their Food - Strange Stuff And Funky Things
Wild chimps upgrade termite-fishing tool
Chimps use dipping sticks to harvest water from tree holes. They're the only ones that can reach the resource
Diverse digging methods with stick tools used by the bonobos at BHS.
How Animals Actually Eat Their Food - Strange Stuff And Funky Things
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10 Fun Facts about Chimpanzees