They found that colonizing an adult germ-free animal with normal gut bacteria had no effect on their behavior.

FORBES: Thinking With Your Gut. Literally.

But some see the interest in fake animal material in fashion as simply the trickle down effect from more of the real thing appearing on runways.

CNN: Vegan couture: Faux meets fabulous

Awareness of the "Clever Hans Effect, " as it is now known, has greatly improved animal experimentation.

WSJ: The Brains of the Animal Kingdom