Police say someone called to tip them off about a toothy beast in a house in the St. Vital (vee-TAHL') area.
Officers checked it out Wednesday and found an American alligator just over half a metre long that was apparently being kept as a pet.
American alligators can grow up to 4 1/2 metres in length.
Keeping any alligator as a pet is illegal.
Winnipeg's animal services agency is looking for a zoo to take the animal, which is normally found in southern states such as Florida, Louisiana and Texas.