This is my pacman frog, Bowser. He is the laziest creature I've ever heard of. He's lazier than a sloth. Sloths move. Sloths reach for food and feed themselves. Bowser can't do anything at all. The one thing he has evolved to do (eat), he won't do himself either!
A pacman frog, or an 'Argentine horned frog', is basically a wide mouth with a stomach attached. They can't jump, they can't swim, they piss where they sit and when anything close to mating occurs, the larger frog is very likely to eat the potential partner. All they do is eat. Sometimes their prey is only just slightly smaller than themselves since their whole body is taken up by stomach.
Bowser eats cockroaches, mice, worms, locusts and crickets, but only if I put them into his mouth myself. I could have him sit next to a cricket all day and he won't go for it. As soon as I pick him up and slide my Boots Advantage card in his mouth to slide a meal between his toothy jaws, he gets all excited and chomps down on cockroaches or whatever else straight away. What a weirdo. I really think he is just that lazy. *sigh*