Ed Yong, writing for Nature:
At the Mission Creek Corrections Center for Women in Belfair, Washington, inmates are helping to save the endangered Taylor’s checkerspot butterfly (Euphydryas editha taylori). Under the supervision of guards and graduate students, a small group of prisoners is breeding the beautiful orange-and-white insects in a greenhouse outside the prison. They have even carried out research to show what plants the butterfly prefers to lay its eggs on — information that will be crucial for boosting its dwindling numbers.
The prisoners benefit, too. Recidivism is down significantly among inmates who attended just one lecture.