An American man claims to have built up an immunity to snake venom - and was so confident he allowed a deadly black mamba to bite him.
Tim Friede says he has built up a tolerance to the venom of some of the world's most poisonous snakes - after subjecting himself to 100 bites and injections.
And he has now released pictures that show him taking - and surviving - a bite from a water cobra and insists he has done the same with one of the world's most deadly snakes, the black mamba.