It's Alive Animals

First known venomous frogs stab with toxin-dripping lip spikes

Brazilian amphibians carry venoms more deadly than those of pit vipers

yellow-skinned frog

WORST HEAD-BUTT  When this yellow-skinned frog curls back its plump upper lip, bony spikes underneath stab toxins into foes. 

Carlos Jared/Butantan Institute

By Susan Milius

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