The Bahamas are famous for sun, sand—and swimming pigs.

Seven of the feral animals, which are popular as a tourist attraction, have been found dead on Big Major Cay, one of the islands, according to the Bahamas Humane Society. The death toll may be up to 10, which leaves eight or nine of the famous swine remaining—only a handful of which are adults.

Though initial reports suggested that tourists had given the pigs fatal doses of alcohol, Humane Society inspector Ventoi Bethune told National Geographic that the dead swine had likely ingested sand.

Veterinarians who visited the site found large quantities of sand in the deceased animals’ stomachs, which Bethune says may have been caused by a recent influx