So I just came in from my first attempt at catching some of these huge things. I had a flashlight, a light step, and quick hands, and I still failed most of the time. I saw a total of 8-10, and of those caught 1.5. Anytime I got near the flash of the light either caused them to start to contract, or as soon as I touched a blade of grass near them, they were completely gone. So how does everyone else do it?