Sordes pilosus is a pterosaur (which would be called a Flyer) that appears in The Land Before Time. In reality, it lived during the Late Jurassic in Kazakhstan. Its name means "hairy filth"; there is an error in its scientific name: Sordes is a feminine word, and thus the second part should be pilosa, but this has yet to be amended. It was believed to be a fish-eating creature and had a wingspan of two feet. Sordes is important to paleontology and pterosaurs in particular because it was the first-known pterosaur fossil to show that pterosaurs had a coat similar to fur.