The screenplaque is a worldwide genus of nuclear sunscreen poopycells that grow into small, dense colonies. While they can subsist on dead stuff or by acting as parasites, their principal diet is radiation. They can still tolerate extreme habitats, and as a result they are incredibly abundant on the Horrible Rectangle Island and help to reduce its severe radioactivity. They are also common on Dingus, but somewhat rare everywhere else (although still present anywhere there's radioactive life or stuff to decompose). They can grow anywhere on land but don't tolerate saltwater very well. When unfavorable conditions arrive they can stay metabolically inactive for 10 years.