Curiosity about cats has followed humankind since the days before Egyptian pharaohs treasured them as signs of good fortune. Much more is known today about what makes these graceful critters tick, yet we're still mesmerized by a cat's nighttime eyes and find comfort in the mysterious vibration of a gentle purr. Taken individually, the bits and pieces of cat anatomy and behavior are a crazy quilt of Morse code, text messaging and DIY survival tips. Together, they're a medley of fun facts that add up to a fur-covered package of intrigue. Let's look at five unusual cat anatomy facts.