They shall not pass

THE art of moat-building isn’t dead. Tropical ants are still experts at making life hard for invaders. Many tree-dwelling ants chomp on the leaves of plants near their home while leaving their own tree alone. Now biologist Walter Federle from the University of California at Berkeley has shown it’s not just for the benefit of the plant – the insects are also cutting off routes that other ants could take to invade their patch. Federle and his team studied Crematogaster ants in Malaysia, and found that ant species that live on plants with slippery,
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