I'm debating whether this is a troll or there might actually be a person desnse enough to need to ask this question. Let's go with dense.
It wouldn't be legal. There is a no firearms discharge bylaw in Toronto.
In the absence of a firearms discharge bylaw you could hunt coyotes on someone else's property with a small game licence. There is no season on them in Ontario, only a requirement that you use a rifle of less than .275 caliber in selected Southern Ontario townships.
In the absence of a hunting licence a person may shoot wildlife on their own property or use an agent authorized by the Ministry of Natural Resources. You can't go on another person's property and shoot animals unless you are hunting.
Upon firing your rifle in Rosedale ravine at a coyote you can expect to enjoy the experience of having an MP5 stuck in your ear, handcuffs snapped on your wrists and a ride in a police car to the Don Jail where you will be incarcerated potentially with a large angry man who looks longingly at your ass. There you will remain until your bail hearing.
Let us know how it works out for you.