The platypus may look like the kind of thing a budding mad scientist would enter in an elementary school science fair, but the creature’s odd appearance is merely a distraction from its unlikely defense mechanism: an ankle spur behind its hind limb. And only the male platypus is able to secrete a venomous toxin that can incapacitate a person and leave them with a long-lasting case of hyperalgesia: an extreme sensitivity to pain.
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