In the 1930s, Eurasian wild boars were brought to Texas and released for hunting. They bred with free-ranging domestic animals and adapted to the wild. They have hybridized with feral domestic hogs and continue to spread. Dark-haired pigs are more likely to survive in the wild and develop curved tusks and thick bristly hair. Considered an invasive species, the Texas wild boar population exceeds 2.5 million and hunters are allowed to trap them year-round without limits.