Slavemaker ants raid other ant colonies to bring back pupae, who then grow up to be the labor force. Now it turns out these social parasites show remarkable strategy and intelligence in choosing their future slaves.
...a dung beetle! Australia's Onthophagus taurus, to be precise, according to a months-long series of tests designed to determine which insect could pull the most weight. What's the dung beetle's secret? Diet.