The vultures live at a zoo in Amsterdam and have been in a long-term relationship for years.
Michaela Morgan

2 Jun 2017 - 12:21 PM  UPDATED 2 Jun 2017 - 12:21 PM

Two male griffon vultures are celebrating the birth of their adopted chick, after caring for the egg in their nest for two months.

The couple—who live at the Artis zoo in Amsterdam— are in a long-term relationship.

"We have had them for some years. They always build a nest together, bond and mate together," zookeeper Job van Tol told the BBC.  

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After staff at the zoo discovered a lone egg at the bottom of the aviary, they first placed it in an incubator before deciding to place it in the nest of the two male vultures.

The pair took turns sitting on the egg for two months before it hatched.

"It was a bit of risk as we had no guarantees of success, but we thought, finally, this is their chance," said Mr van Tol.

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The birds have been caring for their now 20-day old chick, sharing fathering duties and breaking up food for their chick.

It’s the first time in five years that the zoo has had a successful hatching along with another chick who was born to heterosexual parents at the same time.