This is another video I found.
This was filmed by James Yule who is a Wyoming wildlife photographer I have been following on Facebook for a couple of years.
This is a group of wild horses that are in Northern WY, Washakie County to be exact.
That is where Trax is from, so these must be his relatives.
FYI this one is kind of long, about 15 min, but it is super interesting watching the herd dynamics.