"In the first case, we had a female crossing a pool; and this female has crossed this pool by using a detached stick and testing the water depth, and trying to use it as a walking stick," he told the BBC.
The second case saw another female gorilla pick up the trunk of a dead shrub and use it to lean on while dredging for food in a swamp.
She then placed the trunk down on the swampy ground and used it as a bridge.
"What’s fascinating about these observations is the similarity between what these creatures have done, and what we do in the context of crossing a pond," observed Dr Breuer.
"The most astonishing thing is that we have observed them using tools not for obtaining food, but for postural support."
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