|"Don't worry, Mallowkit. Your mother will be back in a moment. Sneezekit's probably with her."|
|— Swallowtail reassuring Mallowkit in Dark River, page 134|
Swallowtail was a RiverClan warrior under Leopardstar's leadership in the lake territories. As an apprentice, Swallowpaw was mentored by Mosspelt before earning her warrior name of Swallowtail. She mentored Splashpaw and participated in the Great Journey. Swallowtail briefly befriended Rainwhisker of ThunderClan, but their friendship didn't last after the journey ended. She later retired and became an elder.
In The New Prophecy arc
- Swallowtail is a RiverClan warrior, and her apprentice is Splashpaw.
- Rainwhisker: "Hi, Swallowtail! How's the prey running?"
- Swallowtail: "Fine."
- Starlight, pages 228-229
In the Power of Three arc
- Swallowtail is now an elder.
- Sneezekit: "Graymist? Graymist?"
- Swallowtail: "Sneezekit? What are you doing away from your mother?"
- Dark River, page 134
In the Novellas
- "Well I wasn't going to let that trout get away just because my leg hurt a little. Thanks, Mothwing, I was afraid I'd made it worse."
- ―Swallowtail Mothwing's Secret, page chapter 7
In the Field Guides
- Swallowtail appears in Blackstar Speaks: Ambush by the Lake. She is described as plump and lazy with a distinctive rolling gait. When Blackstar and his cats attack the RiverClan patrol, Blackstar comments that he is impressed that the overfed she-cat could move so neatly. Cedarheart then blocks her way towards the halfbridge to cut off a route of escape.
- Mothwing's Secret
- Dawn (First appearance; allegiance only)
- Twilight (Allegiance only)
- Sunset (Allegiance only)
- Leafpool's Wish (Allegiance only)
- The Sight (Allegiance only)
- Dark River
- Outcast (Allegiance only)
- Eclipse (Allegiance only)
- Long Shadows (Allegiance only)
- Sunrise (Allegiance only)
- Hollyleaf's Story (Allegiance only)
- Battles of the Clans
The following information is from sources considered non-canon or retconned.
- In Su Susann's "Missing Kits" on Vicky's Facebook, Swallowtail's parents were Whitefang and Petaldust. She and Reedwhisker were mates and their sons were Rainstorm and Mintfur. She named Rainstorm after Rainwhisker, who she became good friends with during the Great Journey.