** Contains some upsetting scenes **

As a species, we humans can be uniquely horrible to our own kind. But are we the only animal to commit murder? Listener Michelle’s question sends CrowdScience trekking – and getting lost - in the Budongo rainforest in Uganda in search of one of Man’s closest relatives, the chimpanzee.

We hear from the scientists, who only days before the team’s arrival at the camp, witnessed a gang of chimps brutally killing another adult. But does chimpanzee lethal aggression pass muster as murder? We head to the capital Kampala for some legal advice and take a look at the grim history of putting animals on trial.

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Presenter: Geoff Marsh

Producer: Louisa Field

(Image: Closeup of angry chimpanzee Credit: Getty Images)