Our summer student-teaching assignments were all at, well, a four-days-a-week summer school; some students were there because they (or their parents) wanted More Learning; others were there for remedial work. Interesting mix (since STEP was all about heterogeneous learning, it was a good environment for that). Anyway, the school had the luxury of a sort of mini-nature preserve--a pond, a lot of native flora, and maybe some of the fauna--for science stuff. The science class did a basic experiment (these were middle schoolers) gathering data on whether crawfish liked bacon or [something else] better as bait. At the end, they caught a bunch and steamed them that day and served 'em. Since we were next door and there were plenty, we got some too! Absolutely delicious. I was under the definite impression that the crawfish population was more than healthy.