The fangs, the arched back, the puffed up fur . . . you don't need a degree in animal behavior to know this is one pissed off cat. What's the term for hair standing on end?

Also known as goosebumps, piloerection is a reaction triggered by the sympathetic nervous symptom to stimuli such as fear, cold, and emotion. Cats, along with mice, chimps and certain other mammals, puff up in order to appear larger to a potential attacker.

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