. >> harry greer is raising endangered oregon spotted frogs for release back into the wild. >> see the spots. the biggest ones we had last year were 58 gram. >> but harry is not a professional and these fat, healthy frogs are not the only ones waiting for release. >> i'm here on a-- i have 18 months 10 days and a wake-up. i'm done. >> reporter: this is the cedar creek correctional center near olympia. >> how often are you testing the water quality? >> reporter: the frog rearing program here pairs inmates with scientists from the evergreen state college as part of the sustainable prisons project. so far the frogs grown as cedar creek are doing better than those grown by professional zoologists. >> they have a lot more time here to care for the frogs that a zoo wouldn't have. i mean they're here all day with twhem, so they change the water frequently, they feed them more frequently than a zoo could ever do. >> how are you doing? >> reporter: dan was superintendent at cedar creek back in 2003. at that time, dan needed to expand the inmate capacity but his water treatment plant was maxed o