The zoologist adopted his bizarre outfit in the hope of getting closer to a colony of Nile crocodiles, which can grow up to 20ft. His disguise was a prosthetic head attached to the front of a protective metal cage covered with canvas and a generous plastering of hippo dung to mask his human scent. It was 13ft long - average Nile size. The head was made of glass fibre, while the frame of the body was aluminium covered with a sheet of Kevlar body armour.

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