Were people shooting the Grey Eagles to make them extinct?
In the 1800s they were killed by gamekeepers and hunters alike, because they were competition for the smaller game.
What really made them extinct was pollution, though. Their main diet is fish and they would build so much DDT and quicksilver up from eating those that their eggs couldn't hatch.
Today pregnant women here are warned not to eat too much fatty fish ( salmon, trout etc,) from the Baltic, because of the amount of quicksilver they contain.
What brought the eagles back was strict protection and a interscandinavian project, where food was put out for them ( dead farm animals, mostly) in winter to de-toxify them before nesting season, so the eggs would be healthy. That really worked great, and as a bonus it kept the young eagles who were not yet adept at hunting, from starving.
After not having eagles in Denmark for over 50 years, last year we had 21 breeding pairs, raising 38 young ones.
So now they don't get fed anymore , but have to catch their own food.