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The blue-ringed octopus, despite its small size, carries enough venom to kill twenty-six adult humans within minutes. Their bites are tiny and often painless, with many victims not realizing they have been envenomed until respiratory depression and paralysis start to set in.

The Emperor Penguin. Sure, the emperor is the tallest and heaviest penguin, a fact that by default makes it the toughest of these beautifully weird, flightless birds. But weighing 80 pounds and swimming like a torpedo is hardly enough to offset awkward waddling and a lack of teeth or claws, so...