Q: Are wild horses non-native?
A: They are reintroduced natives. Horses evolved in North America but went extinct about 10,000 years ago. Modern wild horses fill that old ecological niche. Some debate this, noting changes since then, but advocates see them as a restored keystone herbivore.
Q: Do they outcompete wildlife like pronghorns or bighorn sheep?
A: No. In fact, they can help ecosystems. At Anza Borrego NP, bighorn sheep deaths spiked after horses were removed—mountain lions turned to sheep instead. Scientists note livestock, not horses, cause most rangeland damage. Livestock numbers are far higher and have heavier impacts.
Q: Do they overgraze and raise wildfire risk?
A: No. Horses roam widely, spreading out their grazing. This mobility prevents overuse and allows plants to recover. Even at fence lines, horse-grazed areas often show 30% more native grasses than cattle-grazed areas.
Q: Isn’t wildfire control better achieved with prescribed burns, invasive species control, and targeted grazing?
A: In wilderness, burns and machines are not allowed. Here, wild horses act as natural fire managers. They eat flammable grasses and brush, lowering fire risk. A single horse can clear about 5.5 tons of fuel a year—the equivalent of reducing 5–7 acres of wildfire-prone vegetation.
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