Hugh Lofting 
Doctor Dolittle in the Moon 

In Doctor Dolittle in the Moon Doctor Dolittle has landed on the Moon. He meets Otho Bludge the Moon Man, a Stone Age artist who was the only human on the Moon when it broke away from the Earth. The animals of the Moon flock to Doctor Dolittle, and he discovers how to communicate with the intelligent plants there too. But will the lunar flora and fauna ever let him leave?