A mature Vietnamese pot-bellied pig roams the streets of the Cantera community in San Juan, Puerto Rico, Dec. 11, 2020.
It’s the latest non-native species to invade communities in Puerto Rico like iguanas and caimans did before them, although these are proving particularly hard to control and can't be killed for food because they carry so many diseases.
While there are no official numbers, Olivieri said he estimates there are now thousands of pigs roaming across Puerto Rico, with 67 of the island’s 78 municipalities reporting sightings.
He said that while feral hogs are a problem in the U.S. mainland, it is nowhere near the level of what’s happening with the Vietnamese pot-bellied pigs in Puerto Rico.
“It’s become a health problem.”