Eldest son of River of Mud and Speckled Pebble. Swift Thunder was found alone as a pup, much like his adopted father. Feeling for the pup, River of Mud brought him back and chose to raise Swift Thunder himself. His adoption is what lead to his parents pair bonding, Speckled Pebble admiring the dedication and maturity River of Mud had shown when taking Swift Thunder in and the spark in interest lead to Swift Thunder's first little siblings being born the next season.
Adopted Father: River of Mud
Adopted Mother: Speckled Pebble