Slime is a non-Newtonian fluid, which means the way it flows changes under stress. ![]() If a hagfish is stressed, it releases a small amount of slime (less than a teaspoon) which instantly expands by 10,000 times! To stay safe at night, parrotfish produce mucus cocoons to sleep in. When opossums feel threatened, they play dead and release a smelly mucus to ward off the predator.
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