In the late 19th and early 20th centuries, the main threats to Osprey populations were egg collectors and hunting of the adults along with other birds of prey, but Osprey populations declined drastically in many areas in the 1950s and 1960s ; this appeared to be in part due to the toxic effects of insecticides such as DDT on reproduction.

In the late 19th and early 20th centuries, the MAA was one of the most important sporting institutions in Canada, and North America, with affiliated teams winning ice hockey's Stanley Cup and Canadian football's Grey Cup and cricket.

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