Toronto's TTC uses sound cannons to combat the 10,000 to 15,000 seagulls that make a home on top of the Leslie Barns streetcar facility. It is to drive away animals and birds that cause damage to agricultural and horticultural products, etc. According to the spokesperson of TTC, this number of seagulls and this volume of their excrement can actually create a health hazard.

"These balls are not used all the time, but they act as a support for the nets installed on the roof," he explained. Currently, this method has been proven to be effective. The birds are not happy with our action because they cannot land on the roof. 10,000 to 15,000 seagulls weigh a lot. "For example, if they all decide to build houses on the nets, they might tear them down."

According to one employee, many people's vehicles in the area are often covered in seagull droppings.

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