BRYAN, Texas, Feb 3 (Reuters) - On a bitterly cold January morning, a helicopter soars above central Texas farmland.
The four passengers hanging outside the aircraft are hunting - going after feral hogs, an invasive species in the southeastern United States.
First introduced to North America by early explorers hundreds of years ago, feral hogs can wreak havoc on agriculture, tearing up soil and eating plants.
According to the Texas Parks and Wildlife Department, an estimated 6.9 million feral hogs roamed the United States in 2016 – with more than one-third of that population, 2.6 million hogs, living in Texas.
For hunters like Mitchell Birkett, a 21-year-old Texas A&M University student, going after the hogs was a chance to combine pleasure with purpose.