Vigilantes took the black and white beast to the police saying it was an armed robber who had used black magic to transform himself into a goat to escape arrest after trying to steal a Mazda 323.
"The group of vigilante men came to report that while they were on patrol they saw some hoodlums attempting to rob a car," Kwara state police spokesman Tunde Mohammed told Reuters by telephone.
"They pursued them. However one of them escaped while the other turned into a goat.
"We cannot confirm the story, but the goat is in our custody. We cannot base our information on something mystical. It is something that has to be proved scientifically, that a human being turned into a goat."
Belief in witchcraft is widespread in parts of Nigeria, Africa's most populous nation.
Residents came to the police station to see the goat, photographed in one national newspaper on its knees next to a pile of straw.
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