A report last week by The Arizona Republic said there were 311 horses in the herd.
The goal is 200, to be reached in ten years.
The darting program started in 2019 with support from the Campaign Against America’s Wild Horses. It has two key components: Pesticides and death.

The advocates will need another seven years finish the job, assuming a zero percent birth rate and six percent death rate.

They’re not on track to hit the target.
They need a way to increase the death rate.
They’ve already driven the birth rate to zero, or nearly so, and you can count the breeding population on one hand. Genetic diversity was overrated anyway.
With few if any new foals hitting the ground, the average age of the herd is increasing so deaths should follow suit.
Still, they need other options.
Nobody spends more man-hours trying to get rid of wild horses than the advocates.
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