# Pearl crescent (Phyciodes tharos) > A small, common orange-and-black butterfly of open, weedy areas in eastern North America that breeds on asters. Source: https://insectscanner.com/species/pearl-crescent/ (updated 2026-10-10) ## Is it dangerous? **Non-toxic.** Pearl crescents are harmless to people. They do not bite or sting. No special first aid is needed if handled; wash hands if you touch a caterpillar or chrysalis to remove any plant sap or dirt. **Pets:** Not dangerous to pets. Caterpillars are not known to be toxic or to cause problems if encountered by dogs or cats, though ingestion of many caterpillars can cause mild stomach upset. ## Quick facts - Scientific name: Phyciodes tharos - Also called: Tharos crescent - Order: Lepidoptera (Butterflies and moths) - Family: Nymphalidae (Brush-footed butterflies) - Size: 25-38 mm wingspan - Colours: Orange, Black, Pale cream, Brown - Habitat: Open fields, meadows, roadsides, weedy clearings and disturbed sites where asters grow - Range: Widespread in eastern and central North America, from southern Canada through the United States and into parts of Mexico - Active: Multiple broods from spring through fall (May to October in much of its range); active during daylight hours - Lifespan: Adults live about 1-3 weeks; whole individual lifespan varies with generation and conditions - Effect on plants: Pollinator - Pest: no ## Overview The pearl crescent (Phyciodes tharos) is a small butterfly in the brush-footed family common across much of eastern and central North America. It prefers open habitats with abundant asters and other weedy flowers. Adults are frequent nectar visitors and have multiple broods from spring through fall in warm areas. Larvae feed on plants in the aster family and often develop quickly through several generations per year. ## How to identify it Adults have a wingspan of roughly 25-38 mm. Upperwings are orange with bold dark (black to brown) markings and a scalloped dark margin; the forewing usually shows a dark discal patch. The underside of the hindwing is paler with a series of small pale or white crescent-shaped marks near the margin (the 'pearls' that give the species its name). Caterpillars are typically dark, hairy or spiny-looking and feed along host asters; pupae are compact and attach to stems or leaf litter. - Small wingspan (25-38 mm) with orange upperwings and bold dark margins and markings - Hindwing underside paler with a row of small pale crescent-shaped spots near the margin - Found in open, weedy habitats where asters grow; often seen fluttering low over flowers - Compare location and subtle wing-pattern details to separate from similar crescent species ## Lookalikes - **Northern crescent** (Phyciodes cocyta): Very similar in appearance; Northern crescent tends to occupy more northern areas and differs in subtle wing-pattern details on the underside—expert comparison or range can help separate them. - **Gorgone checkerspot** (Chlosyne gorgone): Also orange-and-black but checkerspot patterning is usually denser and more grid-like; wing margins and underside pattern differ noticeably on close inspection. ## Life cycle - **Egg:** Females lay clusters of tiny pale eggs on the underside of host aster leaves. - **Larva (caterpillar):** Caterpillars feed on host aster leaves; they are typically dark, somewhat hairy or spiny in appearance and pass through several instars while growing rapidly. - **Pupa (chrysalis):** The caterpillar pupates attached to stems, leaves or low vegetation; the chrysalis is compact and blends with surrounding debris. - **Adult (butterfly):** Adults emerge, feed on nectar, find mates, and repeat the cycle. There are multiple generations per year in most of the range. ## Diet and predators - Young eat: Leaves of asters and other plants in the Asteraceae family (various native and weedy species of asters) - Adults eat: Nectar from a variety of flowers, especially low, composite flowers (asters, fleabane, goldenrod and similar species) - Predators of the young: Predatory insects (wasps, ants), spiders, and small predators such as birds and parasitoid flies and wasps - Predators of adults: Insectivorous birds, spiders, dragonflies and predatory insects ## Effect on plants and gardens Larvae feed on various asters and related plants in the family Asteraceae; adults visit a wide range of small flowers for nectar and act as pollinators. ## Where and when to find it Adults visit low flowers in meadows, roadsides and gardens; look for caterpillars on leaves of asters and related plants. Pupae are often on stems or in leaf litter. - Best time: May to October in much of its range, during daylight hours when flowers are open; peak activity on warm, sunny days. - Tips: Photograph both upper- and undersides of the wings for reliable ID; planting asters and leaving some weedy patches increases chances of finding larvae. ## Fun facts - The 'pearl' in the name refers to the small pale crescent or pearl-like spots along the hindwing margin on the underside. - Pearl crescents can have several generations per year; in warm regions you may see them from spring until frost. - They are common in human-disturbed habitats and often one of the first butterflies to recolonize meadows or roadside clearings. ## Frequently asked questions ### Are pearl crescents poisonous or dangerous? No. Pearl crescents are harmless to people and pets. They do not sting or bite. ### Do pearl crescent caterpillars harm garden plants? They feed on asters and related plants but rarely occur at densities high enough to damage gardens. They are not considered agricultural pests. ### Why are pearl crescents in my yard? If you have asters, fleabane, goldenrod or other composite flowers, those provide food for caterpillars and nectar for adults, making your yard an attractive habitat. ### How can I encourage pearl crescents in my garden? Plant native asters and other nectar plants, avoid heavy pesticide use, and leave some patches of weedy asters for caterpillars to feed on. ### How do I tell a pearl crescent from other similar crescents? Look for the small pale crescent-shaped spots on the underside hindwing margin and consider geographic range; some similar species require close pattern comparison or expert ID. --- More about this species: [iNaturalist](https://www.inaturalist.org/taxa/52925), [Wikipedia](https://en.wikipedia.org/wiki/Pearl_crescent). Identify insects and spiders from a photo with the Insect Scanner iPhone app: https://apps.apple.com/app/id1543946563?pt=126685406&ct=web-markdown&mt=8 Identification from photos is never certain: don't handle insects you can't identify, and get medical advice for bites, stings or allergic reactions.