Which fictional character has been played in films by Rex Harrison, Eddie Murphy and Robert Downey Jr.?

Doctor John Dolittle is an English physician who became a doctor for animals after his parrot, Polynesia, taught him to speak animal languages. He lives in the fictional town of Puddleby-on-the-Marsh in England's West Country, along with his many animal friends. He has very few human friends and spends most of his time treating animals, travelling the world with his animals and conducting research into new animals and new forms of animal languages.