Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breed in the Arctic and are displacing birds of less vigorous species.
They hoped Canadians would understand their desire to protect a threatened language and culture, and refrain from interfering in internal Mohawk affairs.
Worries about the outsourcing of jobs abroad have long troubled blue-collar workers. Now migrants are feared to be undercutting even white-collar workers' salaries.
In Scotland, the number of wild salmon have been reduced because of uncontrolled deep-sea and coastal netting, by pollution, and by various other threats to the fish's habitat.