A very interesting paddock with Heck's cattle (Bos taurus) and Heck's horses (Equus caballus) standing in for the extinct aurochs (Bos primigenius) and tarpan (Equus ferus ferus)
Interestingly enough, it's been discovered relatively recently that Tarpans weren't a genuine species of wild horse. They were, most likely, hybrids between feral domesticated horses and actual wild horses.
That being said, Heck horses still make stellar stand-ins for them considering they're hybrids between domesticated horses (Icelandic and Gotland ponies initially, with Konik blood added in later) and Przewalski’s horses themselves.
@Wisp O' Mist Indeed, even though Heck's livestock were as "prehistoric" as Colossal's """""""Direwolves""""""", it's still neat to see these interesting forrays into genetic science be exhibited in this manner, as an analogue for extinct animals. In the same way, I could imagine African cheetahs standing in for the extinct American kind, for example.