Army ants, the most effective predators on Earth, with 100 per cent strike success, are the unequivocal rulers of tropical forests. Giant cockroaches the size of house mice, together with scorpions and fuzzy-brown tarantulas, run for their lives along with myriad smaller insects. A tiny, striped coral snake slithers past my boot. Hot on its heels is a seriously perturbed tortoise racing for the horizon in this Costa Rican forest. It's a multi-species maelstrom, fleeing from a band of lethal assassin
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