That link to live video of a wild boar lair in Estonia reminded me of these cameras on a bald eagle nest high over a lake in Georgia, USA. They have already returned and cleaned out the old interior and put in new fluff, and the hen is already sitting and ready to lay eggs, maybe in February.
Last year, I watched off and on, and saw a great horned owl swoop down at night only to be met by the male eagle coming down on him. After the hatching, the bringing of fish, frogs, rodents to the nest was non-stop.
Berry College - Eagles