Sorreltail is a calico she-cat with amber eyes.
Sorreltail is a ThunderClan warrior, the only daughter of Willowpelt and Whitestorm and the littermate of Sootfur and Rainwhisker. Introduced in The Darkest Hour as Sorrelkit, an adventurous young kit, she followed her half-brother Darkstripe and caught him speaking to Blackfoot on ThunderClan territory during the events of the book. She was seen by Darkstripe, who then tricked her into eating deathberries to keep her quiet about his treachery. After recovering, she told Firestar what Darkstripe did to her, bringing about his exile from ThunderClan.
She is an apprentice, Sorrelpaw, in Firestar's Quest, mentored by Sandstorm, although due to Sandstorm's being away from ThunderClan on the journey to find SkyClan during the events of the book, Sorrelpaw is temporarily mentored by Dustpelt. In between Firestar's Quest and Midnight, Sorrelpaw is struck by a monster, injuring her shoulder. Sorrelpaw eventually recovers under Cinderpelt's care, but has to train for longer than that of a usual apprentice. In Midnight, Sorrelpaw finally receives her warrior name, Sorreltail, and becomes best friends with Leafpool. Whenever Leafpool needs to go out, she always asks Sorreltail to go with her.When the four Clans reach their new lake home, Sorreltail falls in love with Brackenfur and they became mates. Sorreltail gives birth to her kits in Twilight during an unexpected badger attack, but was saved by Cinderpelt, who died trying to defend Sorreltail and her kits. In the end, she gives birth to four kits, Molekit, Poppykit, Honeykit, and Cinderkit, named in honor of Cinderpelt. Sorreltail's also kin to Patchpelt, Leopardfoot, Spottedleaf and Redtail, grand-daughter to Swiftbreeze and Adderfang, Snowfur and Thistleclaw, grandniece to Rosetail, Sweetpaw and Bluestar, great-grand-daughter to Windflight and Poppydawn and Moonflower and Stormtail, great-great-niece to Goosefeather, and Pinestar , kin to Tigerstar, Mistkit and Nightkit, Longtail, and Sandstorm, Brambleclaw, Tawnypelt, Tadpole, Mothwing and Hawkfrost, Squirrelflight, Leafpool and aunt to Graystripe's kits.