A gay vulture couple has hatched a baby chick at a Dutch zoo, marking a momentous milestone for the lovebirds that had been trying to start a family for months, their caretaker said Thursday. The pair of male griffon vultures at the Artis zoo in Amsterdam recently welcomed a chick after taking in an abandoned egg in their aviary unit, zookeeper Job van Tol told TIME. While it’s common for same-sex couples to form in the animal kingdom, it’s rare in the bird world for two males to successfully hatch an egg, and it's the first time this has happened at the Artis zoo. “It’s a beautiful story,” van Tol said. “They proved they can.”

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