Not in Calgary but they also come around in Vancouver in the summer for about two weeks, usually July but only in specific pockets of the city. Really annoying cuz they seem to come out during very hot days forcing you to close your windows and turn on the AC. At a red light you can see as many as 10-20 on your windshield and windows.
I'm assuming they die off after a short period cuz they disappear and don't come back until the following year.
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