Whack Smack Thump On a hot sandy beach, two hermit crabs are wrestling. The crabs are fighting over a large empty snail shell. First one crab grabs the shell, then the other pulls it away. The fighters roll over and over in the sand. What's so special about the shell? Each of the crabs wants the shell as its new home Filled with information perfectly suited to the abilities and interests of its primary-grade audience, this colorful, fact-filled...