Todd Engelmeyer, a biologist with the Virginia Department of Wildlife Resources, deploys nutria platforms in the Chickahominy River May 17, 2021. The platforms attract the invasive rodent, allowing biologists to collect data aimed at gauging the size of the population and problem. Nutria were confirmed on the north side of the James River for the first time in 2020, a spread into territory that's ripe for a population explosion.