Animal, rocks etc all believe in God although we cannot tell.
There was one fox that took a sheep from a flock and then the Shepperd got it back. The fox said to the Sheppard, "You have taken my provision from me and I will tell you something else, there is Messenger that has come."
The Sheppard found Muhammad (peace and blessings be upon him) and became Muslim. Once some rocks were heard to be praising God in the palms of the Prophet Muhammad (peace and blessings be upon him).