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Neither. according to a site, it's
The Poison Dart Frog that is the most poisonous animal on earth.The 2 inch long (5cm) golden poison dart frog has enough venom to kill 10 adult humans or 20,000 mice. Only 2 micrograms of this lethal toxin (the amount that fits on the head of a pin) is capable of killing a human or other large mammal."
wrong answer .-.
Oh, is that so? I just based my answer on google.