That was an interesting rabbit hole…10-22k caribou died in one migration event in ‘84 trying to cross the rivers! Sounds like the hydro plants were are least partially responsible.Caribou hunting in Quebec closed in February 2018. The population took a terrible nose dive. It may never reopen. Climate change is the main cause listed by the Quebec government. I have travelled and hunted in northern Quebec extensively. The real cause of the population decline : Hydro Quebec flooding huge areas of tundra to create reservoirs to power hydro electric plants. They even reversed the flow of a major river !!! They effectively cut off the migrating caribou from wintering and calving grounds. I have toured some of the power plants east of James Bay. Impressive, But I would rather hunt caribou.