To understand plastic’s impact on humans, scientists study Forest Park’s turtles

This summer, researchers from St. Louis Zoo spent hours in Forest Park studying what the turtles living there eat — and excrete. The work is part of a yearslong mission to understand how plastic affects the natural world. Dr. Sharon Deem, a veterinarian and director of the Institute for Conservation Medicine, talks about why she and her team are focusing on the snapping and box turtles living in…