Mark describes himself as a "vegetarian who eats fish", although when pressed, wearily said he was happy also to be described as a "carnivore who doesn't eat red meat. Or white meat. Or anything that walks." He noted that the film Madagascar seemed to take exactly the same stance.
Fish deserve to be eaten on the grounds that "if they can’t be bothered to evolve and get out of the water and get onto the land where all the movies and fun stuff is happening, then they're on their own.”