Giant Swallowtail
Papilio cresphontes
Quick Rearing Snapshot & Biology Overview
Rearing and biology notes for Giant Swallowtail
Common Rue (Ruta graveolens), Common Prickly Ash (Zanthoxylum americanum), Wafer Ash / Hoptree (Ptelea trifoliata)
~37 Days total (Egg → Butterfly)
Pupal Diapause (Does Not Migrate)
Girdle / Twig Sling
Thermal Degree-Day Hatch SimulatorInteractive
Slide ambient temperature to see how heat accelerates metamorphosis for Giant Swallowtail
*Calculated via standard insect thermal summation models (base threshold 50°F / 10°C).
Giant Swallowtail
Papilio cresphontes (Cramer, 1777) — Papilionidae • Papilioninae
- Largest butterfly in the United States and Canada, spanning over 6 inches
- Dark chocolate-brown to black dorsal wings slashed by a bold diagonal yellow chevron band
- Hindwing tails feature unique bright yellow droplet centers inside spatulate black tips
- Ventral surface is almost solid brilliant canary-yellow with delicate turquoise crescent lines
- Larva ("Orange Dog") mimics a glistening bird dropping with a pungent red osmeterium horn
Larval Host Flora:
Silo 02 BotanyOnly supply fresh, pesticide-free foliage from these verified native botanical species:
- •Common Rue (Ruta graveolens)
- •Common Prickly Ash (Zanthoxylum americanum)
- •Wafer Ash / Hoptree (Ptelea trifoliata)
- •Citrus Trees (Orange, Lemon, Lime, Grapefruit)
- •Hercules Club (Zanthoxylum clava-herculis)
Key Husbandry Tips
Silo 04 Husbandry- •Larva is known as the "Orange Dog" — an astonishing realistic mimic of a glistening bird dropping that avoids all bird predation.
- •Equipped with a bright crimson, forked osmeterium scent horn behind the head that emits a pungent citrus/terpene musk if poked.
- •Very hardy and easy to raise on potted common rue or garden citrus seedlings.
Frequently Asked Questions (Giant Swallowtail)
Direct answers to the most common rearing, diet, and metamorphosis questions
Master Research Guides for Giant Swallowtail
Rearing protocols, lifecycle stages, and field husbandry
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