The diversity of rotifers is stunning, and many different species are overviewed. Planktonic rotifers have special adaptations for open water life. Nematodes (roundworms) include a number of important human parasites, seldom seen but easily found. Tree moss, leaf litter, and compost piles swarm with nematodes. Accessibility options on the DVD are: (1) audio description, (2) expanded audio description, (3) English SDH subtitles, (4) closed captions.