Dutch Eagle Owl Juggles Two Families in Rare Mating Event

A male eagle owl near Maastricht has his work cut out for him this spring. In a surprising twist on typical owl behavior, he mated with two different females within an hour, and now he's responsible for feeding two separate nests of hungry chicks.

Marjon Savelsberg has spent a decade tracking the eagle owls living in the ENCI quarry on Sint-Pietersberg hill. She heard the male with his usual partner at 11pm one night, then detected him with a second female about half a mile away just an hour later. She identifies individual birds by their unique territorial calls, so she knew immediately what had happened.

"At first I thought: 'What a fool!'" Savelsberg told regional broadcaster L1. The male now faces double duty, hunting enough food for two nests while both mothers stay behind to keep their chicks warm.

The first nest has three chicks, and the second appears to have more, though dense vegetation makes counting difficult. Savelsberg worries the male might struggle to keep up with the demands. "I don't rule out that we will lose young," she said honestly.

Why This Inspires

This unusual love triangle is playing out in a place that holds special significance for Dutch conservation. Eagle owls were hunted out of the Netherlands and most of western Europe over the last century. When a pair finally returned to this very quarry in 1997, they became the founding parents of the entire current Dutch population.

Today, around 80 eagle owl territories exist across the Netherlands, mostly in Limburg and the east. Every owl in the country can trace its ancestry back to that single pair who chose the ENCI quarry as their home.

Bigamy has been recorded in other owl species, but those cases typically ended badly for the young. "Nature is beautiful, but sometimes it is also harsh," Savelsberg noted. She'll continue monitoring both nests closely to see how this uncommon family arrangement unfolds.

The drama offers researchers a rare chance to observe behavior that challenges what we know about eagle owl partnerships, which typically mate for life.