Cool fun fact about Nicolai and Ballstein, they were originally slated to be part of a reintroduction effort in Russia! Sadly, COVID delayed the project and then Russia declaring war on Ukraine nixed it.
You can, however still read about what was planned here:
Regulations.gov
Just download the file, lots of
really interesting stuff in it.
I'm glad to see that Nicolai and Ballstein have finally found a more permanent place to call home. I know that the Minnesota Zoo has really been struggling to find new placements for the Przewalski's horses that were originally slated for the Russia reintroduction.