Jensen discovered (and many subsequent experiments confirmed) that many animals—including fish, birds, gerbils, rats, mice, monkeys, and chimpanzees—tend to prefer a longer, more indirect route to food than a shorter, more direct one.* That is, as long as fish, birds, gerbils, rats, mice, monkeys, and chimpanzees don’t have to work too hard, they frequently prefer to earn their food. In fact, among all the animals tested so far the only species that prefers the lazy route is—you guessed it—the commendably rational cat.