Doctor Dolittle in the Moon by Hugh Lofting

The story of Doctor Dolittle, who studies mystical animals and plants on the Moon. While on his adventure, his friends on Earth long for his return home. Doctor Dolittle has landed on the Moon and is discovering new things each day. 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.