Fangblenny fish aren't just a cute face. They use special opioid-based venom to avoid being eaten.
A Tiny Fish With Fearsome Fangs Uses An Opioid-Like Venom To Escape Enemies : The Two-Way : NPR
A Tiny Fish With Fearsome Fangs Uses An Opioid-Like Venom To Escape Enemies : The Two-Way : NPR