When I was a teenager, I caught a bunch of beetles and put a dot of white out on some of them. Then I went back a week later, caught a bunch of beetles again, a

When I was a teenager, I caught a bunch of beetles and put a dot of white out on some of them. Then I went back a week later, caught a bunch of beetles again, and counted how many had white out on them. Used that to estimate the beetle population. This wasn't a school project.