Common Mormon

📖Overview

Papilio polytes is a widespread swallowtail butterfly found across South and Southeast Asia. Males are relatively uniform in appearance and are strong fliers; females are polymorphic, with some forms resembling distasteful red-bodied butterflies (Batesian mimicry). Adults visit flowers for nectar, while caterpillars feed on rutaceous plants such as citrus. The species adapts well to gardens, farmland edges and secondary forest, and is commonly seen near human habitation.

🔍How to identify a common Mormon

Winged adults have the characteristic swallowtail 'tails' on the hindwings. Males are black with a row of white spots along the forewing margin and a band of white spots across the hindwing. Females occur in several distinct forms: one (cyrus) resembles the male, while others (stichius and romulus) have white patches and red spots that imitate toxic red-bodied swallowtails such as the Common Rose and Crimson Rose; unlike their models, Common Mormons have a black body. The underside is similar but usually paler. Caterpillars at early instars are brown and white and resemble bird droppings; later instars turn green with eye-like markings and an osmeterium (a forked defensive gland) used to deter predators. Pupae are green or brown and resemble a stick or leaf stem.

1. Hindwing with tail-like extensions typical of swallowtails.
2. Males: black wings with a row of white spots along the forewing edge and a white band of spots across the hindwing.
3. Females: several forms — some mimic male pattern, others have large white patches and red submarginal spots resembling toxic red-bodied swallowtails.
4. Caterpillars early instars dark and bird-dropping-like, later instars green with eye-like markings and an osmeterium.

Lookalikes

↻Life cycle

1. 🥚

   Egg

   Spherical eggs laid singly on host plant leaves; hatch in about 3-8 days depending on temperature.

2. 🐛

   Larva (caterpillar)

   Several instars: early instars resemble bird droppings; later instars are green with markings and use an osmeterium for defense. Feeding period typically 2-4 weeks.

3. 🫛

   Pupa (chrysalis)

   Attached to stems or leaves; cryptic green or brown form that resembles a leaf stem. Pupation lasts about 8-20 days depending on climate.

4. 🦋

   Adult (butterfly)

   Winged nectar-feeding adult; mates, lays eggs and completes multiple generations per year in warm regions.

🍃Diet and predators

🌱Effect on plants and gardens

Larvae feed on plants in the citrus family (Rutaceae) such as Citrus spp., Zanthoxylum, Glycosmis and Clausena. Heavy localized infestations can defoliate young plants but serious damage is uncommon in established trees.

How to get rid of common Mormons

For garden-scale control: hand-pick caterpillars, remove egg clusters from leaves, encourage natural enemies (parasitic wasps, birds) and use barrier or soap sprays on small plants. Avoid broad-spectrum insecticides if you want to preserve pollinators; if chemical control is necessary, use targeted products following label instructions.

📍Where and when to find it

Adults: visiting nectar flowers, hilltops and garden plants. Eggs and larvae: on leaves of citrus and other Rutaceae. Pupae: attached to stems, leaf midribs or undersides.

✨Fun facts

• Female Common Mormon shows classical Batesian mimicry; certain female forms mimic distasteful red-bodied species to fool predators.
• Males and some female forms look very similar, but females have several genetically controlled color forms.
• Early-instar caterpillars look like bird droppings — a common camouflage trick among swallowtail larvae.

?Frequently asked questions

📷Photos of the common Mormon