This video from the Netherlands says about itself:
For the first time European bisons have been released in a nature reserve in the Netherlands. This film shows their release in the dunes of Kraansvlak.
Today, these bison were joined by konik horses, in order to have more varied grazing in this sand dune environment. According to Vroege Vogels radio, this is the first time since just after the end of the last ice age that European bison and wild horses meet in nature.
Exmoor ponies are closest relatives of Europe’s wild horses: here.