My sister, who lives with two cats in Southern California, regularly ends our phone calls with some version of “cats rule, dogs drool.” I actually really like cats, but this does bring out my competitive spirit. So when I saw a recent study of the biomechanics of gait revealed that dogs are more efficient than cats, I read on, hoping for some feline weakness to drop into the next conversation. I was disappointed. While it’s true the noble dog is a more efficient machine built for long-distance hunting and that cats expend lots of energy with their unnerving stalking style; it is also true that the energy-flaunting way cats slink along with each paw touching down silently is exactly what makes them such superior hunters. Read the sordid details.