This is super interesting!
Bald Eagle Trio Paired for Life?
"Male Valor 1 was young when he was spotted at the nest site in 2012. He is presumed father of that year’s two eggs, but he wasn’t helpful at incubation or feeding the young, and both eaglets died. In 2013, two males hung out at the nest, but Valor 2 apparently replaced Valor 1, and produced two young with female Hope. The next year, vegetation obscured the nest, but three adults appeared to be tending the young. In 2015, three adults were clearly seen tending the nest: Valor 1, Valor 2, and Hope. This was proving interesting, so Stewards of the Upper Mississippi River Refuge installed a nest camera, and in 2016, it was clearly documented that both males were copulating with Hope, and all three shared in incubation, nest maintenance, and feeding the young. Three eaglets fledged that year. But disaster struck in 2017: After two eggs hatched, two “foreign” adult bald eagles attacked the nest repeatedly for several consecutive days. Valor 1 and Valor 2 defended the nest, but Hope disappeared, never to return. Both dads raised the two eaglets to fledging. That September, a new young female turned up at the nest, and both Valor 1 and Valor 2 courted her. She laid two eggs in 2018, and all three adults tended them. Only one eaglet fledged, and the new female was named Starr. In 2019, she and her mates produced three eggs between February 18 and 24."