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During a simulated dinosaur encounter in the third episode of "Prehistoric Park", Marven declared himself a vegetarian. Throughout the series he applies the same term to naturally herbivorous animals. In the second episode of "Untamed China" series he says the team cooked vegetarian food especially for him. Nigel confirms he is a vegetarian on his official website by stating that the Peregrine falcon is his favourite animal and that he would love to be such a bird, but because he is a vegetarian eating raw pigeon would make that hard. In "Panda Adventure" Marven states that he is "usually teetotal" when having a celebratory drink with a team of Chinese trackers who led him to see pandas close-up in the wild.