On the Road with Mavis and Marge by Niamh Sharkey
Mavis and Marge are different from other animals. They want to go a-wandering. Over the hills, across the sea, and up to the moon they go, gathering a band of free-range friends on the way. But, suddenly, from across the Milky Way, home has a distant allure. A zany bunch of pals succumb to wanderlust and get more than they bargained for.