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by goda90 2474 days ago
Concerning passenger pigeons[0], which went 100% extinct in 1910 due to hunting: "in 1866, one flock in southern Ontario was described as being 1.5 km (0.93 mi) wide and 500 km (310 mi) long, took 14 hours to pass, and held in excess of 3.5 billion birds."

[0]https://en.wikipedia.org/wiki/Passenger_pigeon