Crows are very aggressive, they dive bomb foreheads regularly, but then the whole Lower Mainland should be covered with such signs, and they're not crows I guess but corvids (or corvidae?), and while seeming to attack, they are actually defending:
And there's a live interactive website where you can track and report defensive aggressive corvids in real-time in the Vancouver area:
Michael Filimowicz, PhD
Faculty of Communication, Art and Technology
School
of Interactive Arts and Technology
Simon
Fraser University
On the path from Horizons Restaurant in Burnaby Mt. Park to SFU there's a sign warning of bears in the area and a sign warning of an "Aggressive Bird".
Anyone know what kind of bird that would be?
I'm curious!
There must be someone here who knows their aggressive birds.
Chris