Utah State University Extension
The Federal government manages feral horses and burros under the Wild and Free-roaming Horse and Burro Act. This fact sheet discusses: what wild and feral horses and burros are, there status and populations in the U.S., the problems caused by over-abundance, how "extra" animals are managed, and future management considerations.
Frey, S. Nicole and Thacker, Eric, "Wild Horses and Burros: An Overview" (2018). All Current Publications. Paper 1840.