https://siberiantimes.com/other/others/news/the-foal-that-came-in-from-the-cold-after-40000-years/
https://www.thesun.co.uk/news/6993830/ice-age-horse-siberia-crater-mouth-of-hell/
https://www.google.com/search?q=40%2C000+foal&ie=utf-8&oe=utf-8&client=firefox-b-1
It sounds like a Przewalski’s horse. I checked all of the links for additional pictures but the one was it.
I would love to see it sans mud. The articles said it was brown with zebra stripes(primitive markings) on the legs.
https://en.wikipedia.org/wiki/Przewalski%27s_horse