We Were Wrong About Mustang Bloodlines: The Hidden Lines We Almost Erased

In this documentary, we uncover a truth almost lost to history: we were wrong about wild mustang bloodlines. For decades, most people believed mustang herds were just random mixes of loose ranch horses. But new DNA research shows that some small, overlooked herds carry rare Iberian and historic ranch bloodlines—living links to Spanish colonial horses, frontier cavalry mounts, and early Western ranch stock.

Through dramatic roundups, tense lab discoveries, and the quiet lives of mustangs in holding pens, we follow the race between science and policy. Are we removing these horses faster than we can understand their genetic value? How many “non-significant” herds on paper are actually irreplaceable in reality? And what happens when a bloodline disappears from the wild forever?

If you care about wild horses, conservation, or the hidden stories written in bone and blood, this film will change the way you see every mustang on the range—and every horse walking up a stock-trailer ramp. Watch to the end, then tell us: now that we know what’s at stake, what should happen next?

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