Read the full post from the Illinois Natural History Survey.
Historically the Ornate Box Turtle was known from 45 counties in Illinois. Today you can count the number of counties with confirmed populations on two hands. This decline landed the species on the List of Endangered and Threatened Species of Illinois in 2009, with habitat loss and road mortality being the greatest threats to its continued survival.
We had the opportunity to survey two of the largest known Ornate Box Turtle sites this past week, with the goal of finding, measuring, and marking as many turtles as possible. With enough recaptures, we can calculate how likely it is for an individual to survive from one year to the next and determine population size. This helps us answer questions including: has population size changed over time? Is the population stable, increasing, or decreasing? Is the population at risk of extinction?