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9 HORSES DIE DURING CALGARY STAMPEDE TRAIL RIDE
At least nine Calgary Stampede rodeo horses died Sunday after becoming spooked while racing across a city bridge, sending them plunging 10 metres into the Bow River.
Ref. https://www.cbc.ca/story/canada/national/20...ede-050704.html
The article never says exactly what spooked them, but implys that it was the horses bunching up together that scared them. I haven't ever heard of that happening before, horses get bunched up together all the time. But they where running full gallop, so I suppose it was something before the bridge that scared them. I see that no one being interviewed really knows what scared the horses and spurred them full throttle across the bridge.