I wonder why snakes shed their skin and other questions about reptiles I wonder why snakes shed their skin：and other questions about reptiles I wonder why snakes shed their skin :: and other questions about reptiles / Originally published: as I wonder why snakes shed their skin and other questions about reptiles 1996 I wonder why stars twinkle and other questions about space I wonder why stalactites hang down and other questions about caves I wonder why Columbus crossed the ocean and other questions about explorers I wonder why camels have humps and other questions about animals I wonder why horses wear shoes and other questions about horses I wonder why leaves change color and other questions about plants