Screamapillar
Wikisimpsons - The Simpsons Wiki
The Screamapiller is an endangered species that takes up residence in the Simpson families backyard in the episode "The Frying Game". It is large and red and similar to a caterpiller and is easily identified by its constant screaming. The Simpsons are forced to take care of it, and Homer accidentally almost kills it, and as punishment is sentenced to community service.