Two men were assessed at the scene by paramedics with one taken to hospital in stable condition as a precautionary measure because of possible smoke inhalation.
Zoo spokeswoman Trish Exton-Parder says it’s believed that a cigarette butt started the fire around the whooping crane exhibit.
Exton-Parder says the conditions throughout the city are ripe for grass fires and hopes people can be more careful.
Fire officials, who also responded to the scene, say it's possible a cigarette ignited some poplar tree fluff.
No animals were harmed during the incident.
(CHQR, The Canadian Press)