The database at the Assateague Island Alliance horse page puts the current population at 78.
The filtering option gives the following breakdown:
- Stallions – 22
- Mares – 34
- Colts – 11
- Fillies – 11
The island was a proving ground for mass sterilization with PZP.
The darting program was shut off in 2016 and since then the population has gone sideways, proving that the pesticide is not reversible as the advocates claim.
A few years ago they pointed to the island as a paragon of wild horse management but now that the results are public, they’ve lost interest.
They know you know they’ve been lying.
Note the abnormal sex ratio—1.5 mares for every stallion—a well-known side effect the advocates dismiss as “mares living longer.”
RELATED: Assateague Herd Grows Slightly.

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