Sela was the mother of Chickenhound, and resided in Mossflower Woods as a healer. Together, she and her son lived with an unnamed band of foxes. Sela had golden eyes, and was a crafty double-dealer of information. When she was ordered to heal Cluny the Scourge, she and her son were able to steal his combat plans. However, Cluny intended for this to happen. The plans said that Cluny was going to use only a battering ram when in reality, he intended to use the ram and tunnel to get into Redwall Abbey.
When it was discovered that Sela was giving information to the Redwallers, Cluny had the two foxes speared by his soldiers. Their bodies were thrown into a ditch, and Sela died from her wounds. In the Redwall TV Series, Sela was injured by Matthias and caught by Constance. She was slain by Cluny's horde soon after.
The TV series implies that Methuselah knew of her, since he mentions "you are far worse than your wicked mother" to Chickenhound when seeing him running from Friar Hugo with the stolen goods. This connection is not mentioned in the book, however.