The BLM began a round up today of the mustangs this gallery. They plan to gather all 159 of them, put 129 back into the desert and adopt out the remaining animals. Although I have never communicated with BLM officials directly, my guess is that the round up is aimed at population control; the 64 females to be released again into the wild will first be given an injection of an infertility drug.
The two stallions in this frame might never make it back home to the range. They are both quite old, too old to maintain a family group of mares. It is very possible that they would be included in the group of 30 mustangs that will be culled and offered to the public for adoption. If no-one wants them, they will be trucked to a mustang facility to 'live out their natural lives'.