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Ted Tubberman stole ova from the biology labs and altered them to make them more obedient. They were good at going after tunnel snakes. However, they turned on Tubberman and killed him, escaping into the wild.
When Fiona and T'mar led a group back in time to the Far Western Continent, one of the dangers they had to guard against was the felines. After most of the dragonriders returned to their present, Xhinna and her people captured a feline who gave birth to several babies before dying. The babies, nicknamed "Mrreows", were adopted by several of the dragonriders.