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Tickies were an alien, invasive animal species who became common in Texas in the late 21st century, believed to have been accidentally introduced to the local ecosystem by alien visitors following first contact. Tickies resembled possums with an additional pair of hind legs, elongated faces, and cat-like, yellow eyes. They were not considered a particular threat to the environment, as no changes had been detected in the Texan natural environment following their spread. (PROSE: Golden Age)