Christian polemicists accused Muhammad of faking miracles with trained animals.

Evidence

Muhammad, or a wicked teacher of Muhammad, trained to eat a grain of corn from the Prophet’s ear, to simulate the Holy Ghost; or of a bull, or calf, or camel, similarly trained to come at his call, bearing the Book of the Law bound to its horns. These were prodigies which it was sometimes believed had been confirmed by further bogus miracles, by secreted milk and honey made at the appropriate moment to flow like fountains. — Norman Daniel, Islam and the West, 200