Sound cannons at Leslie Barns - March to June
March 10, 2025
Starting as early as this week, seagull deterrence measures will be in effect at one of the TTC’s streetcar facilities - Leslie Barns (located at Lakeshore Blvd. E. and Leslie St.)
Since its opening in 2015, the building’s large green rooftop has attracted significant numbers of seagulls. The roof creates an ideal environment for the seagulls to gather and it attracts up to 15,000 gulls annually. The TTC has worked with experts to try several methods to deter them; and while some of the measures helped to a certain degree, unfortunately, the gulls return each year.
The issue can be seen in these photos of the large green roof on top of Leslie Barns, which attracts up to 15,000 gulls a year - posing a risk to health and safety.
The large seagull population on the roof poses a notable health and safety concern for both TTC staff as well as the birds. To address this issue, the TTC will use two sound cannons (also known as a ‘scare cannon’ or ‘bird cannon’) to deter them from returning to the rooftop, in sync with the arrival of the gulls and nesting season.
The use of sound cannons has proven to be the most effective solution recommended by experts to address the gull overpopulation. The TTC has worked with both a biologist and noise consultant to ensure the sound cannons are used safely, effectively, and within Provincial limits.
The sound cannons do not fire ammunition, instead, they emit a loud sound that scares away the seagulls so they relocate elsewhere. No birds are harmed in this process. They were used during the same time period in 2024 and were successful at preventing the seagulls from nesting on the roof.
What to expect
- Noise will be generated from the rooftop sound cannons. The sound cannons may sound similar to a firework in the distance. The cannons will be pointed away from the residential areas to the north to limit the effect of the noise.
Sound cannon hours
- Two sound cannons will be activated a maximum of four times per hour, daily between 30 minutes before sunrise until 7 p.m. and at random intervals. If there are no birds present, the cannons will not be used.
Frequently asked questions
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How loud are the cannons?
Outside, the noise is similar to a distant firework. Inside the building, it resembles a hammer striking a surface in short bursts.
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Are the cannons safe?
Yes. The TTC consulted experts to ensure compliance with noise and environmental regulations. Employees may wear hearing protection if accessing the roof, though it's not required.
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Where will be cannons be placed?
On opposite corners of the roof, directed away from residential areas.
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What other measures are in place?
Framed netting, patrolling, and egg collection will also be used to discourage seagulls from settling.
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Why not use falcons or dogs instead?
Due to the size and layout of the roof and the streetcar wires, falcons and dogs are not viable options.
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Why can’t the seagulls just stay?
Their presence leads to unsanitary conditions, increased maintenance costs, and dangers to chicks that fall from the roof.
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Is the TTC allowed to use sound cannons?
Yes. The TTC has a permit allowing approved deterrent measures under the Migratory Birds Convention Act.
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Will this affect the transit service?
No, but customers on the 83 Jones bus route may hear the cannons when they are passing by the facility.
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Why allow noise before 7 a.m.?
The gulls flock to the Leslie Barns area approximately 30 minutes before sunrise, looking to settle. The facility complies with provincial noise regulations and meets Ministry of Environment standards.
We apologize for any inconvenience this may cause and appreciate your understanding and patience.