This seemed at first like an easy-reader version of The Mysterious Tadpole: a boy gets a present in the mail which turns out to grow into a full-sized alligator when exposed to water. However, I found Bridget the alligator much less sympathetic than the Tadpole creature and wasn't convinced that Zach was really having so much fun with her. Aside from the initial coolness factor she seemed like a drag, always demanding things and making a mess. Also, parents in regions where alligators may actually be encountered may want to warn kids against trying to play with them in real life.
The illustrations were pretty simple and a little boring, but did have great facial expressions. My favorite panels was Bridget being proud of herself for killing the garden hose.