# Banded Hairstreak (*satyrium calanus*) The Banded Hairstreak (Satyrium calanus) is a charming and common butterfly found across eastern North America, known for its intricate wing patterns and playful flight. As part of the 'hairstreak' family, it exhibits characteristic delicate tails on its hindwings, which are thought to aid in predator evasion. This species is a familiar sight in deciduous woodlands and open areas during the summer months, often seen nectaring on various wildflowers. Its life cycle showcases a complete metamorphosis, with the caterpillars feeding on the leaves of oak, hickory, and walnut trees, while the adults fuel themselves with nectar, playing a small but vital role in pollination. - **Category:** [Insects](https://www.snappit.app/explore/categories/insect) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Snaps:** 3 - **Habitat:** Found primarily in deciduous woodlands, forest edges, clearings, old fields, and occasionally suburban gardens with ample host plants and nectar sources. ![Banded Hairstreak](https://inaturalist-open-data.s3.amazonaws.com/photos/87915285/medium.jpeg) Photo: Bernie Paquette, CC BY 4.0 · [iNaturalist](https://www.inaturalist.org/photos/87915285) ## Appearance This small butterfly typically measures between 2.5 and 3.5 cm in wingspan. The upperside of its wings is a uniform grayish-brown. The underside of the hindwings features a distinctive white postmedian line, often bordered inwardly by a row of orange-red spots. Near the two delicate tails on each hindwing, there are usually several small, iridescent blue spots, which can sometimes be obscured. The forewings on the underside are similarly grayish-brown with a faint white line. ## Taxonomy - **Kingdom:** Animalia - **Phylum:** Arthropoda - **Class:** Insecta - **Order:** Lepidoptera - **Family:** Lycaenidae - **Genus:** Satyrium ## Interesting facts - Banded Hairstreaks lay their eggs singly on the twigs or buds of host trees, where they overwinter and hatch in the spring. - Despite their small size, these butterflies can be quite feisty, sometimes engaging in territorial disputes with other butterflies. - The 'hairstreak' name refers to the fine, hair-like tails found on the hindwings of many species in this butterfly group. - They are often seen 'dancing' or rubbing their hindwings together, which enhances the false head illusion to divert predators. ## Special abilities - **False Head Mimicry:** The delicate tails and eye-spots on the hindwings create a 'false head' illusion, leading predators to strike at the less vital hindwing area, allowing the butterfly to escape with minor damage. - **Camouflage Perching:** When resting with wings closed, the underside coloration and patterns blend effectively with bark or dried leaves, making it difficult for predators to spot them. - **Erratic Flight Pattern:** Adults exhibit a rapid and somewhat erratic flight, which can make them challenging for avian predators to track and catch in mid-air. ## Measurements & details - **Length:** 0-1 cm - **Wingspan:** 2-3 cm - **Weight:** 0.0005-0.001 kg - **Lifespan:** 0 years - **Clutch Size:** 50-100 ## Diet & Feeding As larvae, Banded Hairstreaks are herbivorous, feeding on tree leaves. Adults are nectarivorous, consuming nectar from various flowering plants. - **Age differences:** Larvae consume tree foliage, while adults primarily feed on flower nectar. - **Primary Foods:** Oak leaves, Hickory leaves, Walnut leaves, Milkweed nectar, Dogbane nectar, Sumac nectar - **Foraging Method:** Foraging ## Ecological connections - **Host plant:** Oak Tree (*Quercus species*) — Primary larval food source - **Host plant:** Hickory Tree (*Carya species*) — Primary larval food source - **Nectar source:** [Common Milkweed](https://www.snappit.app/explore/common-milkweed) (*Asclepias syriaca*) — Adult nectar source - **Eaten by:** Bird (*Aves species*) — General predator ## Safety **Danger:** 1/5 · Very low No special safety notes yet. ## Frequently Asked Questions ### How to identify Banded Hairstreak? Compare the wing outline, spots, bands, eyespots and wing edges. The underside can look completely different from the top. Check for tails, the antennae and where the markings sit instead of relying on color alone. Butterfly Identifier: upload a photo and compare the visible details. ### How long is Banded Hairstreak? 0-1 cm ### What is Banded Hairstreak's wingspan? 2-3 cm ### How much does Banded Hairstreak weigh? 0.0005-0.001 kg ### How long does Banded Hairstreak live? 0 years ### What does Banded Hairstreak eat? As larvae, Banded Hairstreaks are herbivorous, feeding on tree leaves. Adults are nectarivorous, consuming nectar from various flowering plants. ### Where is Banded Hairstreak usually found? Found primarily in deciduous woodlands, forest edges, clearings, old fields, and occasionally suburban gardens with ample host plants and nectar sources. ### How does Banded Hairstreak hunt? Foraging ## Where to spot - [Ashton Historic District](https://www.snappit.app/guides/places/ashton-historic-district) — Rhode Island, US · Historic District - [Reading Public Museum](https://www.snappit.app/guides/places/reading-public-museum) — Pennsylvania, US · Botanical Garden - [Russian Village Historic District](https://www.snappit.app/guides/places/russian-village-historic-district) — Connecticut, US · Historic District - [South Britain Historic District](https://www.snappit.app/guides/places/south-britain-historic-district) — Connecticut, US · Historic District [View all places to see Banded Hairstreak](https://www.snappit.app/guides/where-to-see/banded-hairstreak) ## More Insects - [Common Eastern Bumble Bee](https://www.snappit.app/explore/common-eastern-bumble-bee) (*Bombus impatiens*) - [Spotted Lanternfly](https://www.snappit.app/explore/spotted-lanternfly) (*Lycorma delicatula*) - [Brown-belted Bumble Bee](https://www.snappit.app/explore/brown-belted-bumble-bee) (*Bombus griseocollis*) - [Eastern Carpenter Bee](https://www.snappit.app/explore/eastern-carpenter-bee) (*Xylocopa virginica*) --- Source: [Banded Hairstreak: Facts & Places to See — Snappit](https://www.snappit.app/explore/banded-hairstreak)