Pound for pound – or more accurately, ounce for ounce – the Rhinoceros Beetle is the strongest known creature in the world, capable of lifting 850 times its body weight. A human being with the same relative strength would be able to lift about 40 cars at once.
This beetle gets its name from its large horns that it uses to fight other males during mating season. In parts of Asia, male Rhinoceros Beetles are pitted against each other while bets are placed on the outcome.
Wikipedia: Rhinoceros Beetle