Wildren
From Tardis Wiki, the free Doctor Who reference
Wildren were a form of human in an alternate timeline. They were created from babies who were aged forty years by the Utopian Engine on the day of the Cleansing. Some Wildren retained the primitive urge to reproduce, and as a result bore offspring. Wildren could not swim, and therefore had a fear of water. (PROSE: Reckless Engineering)