The Carolina Coast Online said today that 111 wild horses were living on Shackleford Banks at the end of 2019, with 38% males and 62% females. Ten foals were born and fourteen deaths occurred.
The best way to protect the herd is public education, according to the story.
The report by NPS said contraceptives had been in use on the island since 2000.
The disparity between males and females, noted as longevity of mares and not mortality of stallions, was linked to the fertility control program.
Unlike the Assateague horses, these results could be produced by a simple random process centered at 50% males / 50% females.