The elusive urban flip-flop crab scuttles across the parking lot until it bumped into the curb. This flat creature can survive in the barren wastes of asphalt but prefers the security and shade of planted areas. Sensing danger the flip-flop freezes; it’s single green pincher raised in defense. To any passerby, this might look like an ordinary abandoned sandal, but the pincer can do serious damage to an unwary foot. It’s best we leave it alone for now.