Can I Play Too? - An Elephant and Piggie Book

Gerald is careful. Piggie is not.
Piggie cannot help smiling. Gerald can.
Gerald worries so that Piggie does not have to.
 
Gerald and Piggie are best friends.
 
In Can I Play Too? Gerald and Piggie meet a new snake friend who wants to join in a game of catch. But how can a snake play catch?