# California Glowworm (*Photinus californicus*) California Glowworms are special insects that light up at night! They are small and can be found in the dark, making them look like tiny stars on the ground. - **Category:** [Insects](https://www.snappit.app/explore/categories/insect) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Snaps:** 1 - **Habitat:** Forests ![California Glowworm](https://inaturalist-open-data.s3.amazonaws.com/photos/2969170/medium.jpeg) Photo: Ken-ichi Ueda, CC BY 4.0 · [iNaturalist](https://www.inaturalist.org/photos/2969170) ## Appearance The California Glowworm is an insect with a soft, elongated body, typically dark brown or black, with a paler segment behind its head. Adult females are wingless and resemble large grubs, while males have wings. Both sexes possess a distinct yellowish-green light organ at their tail end, glowing steadily. ## Taxonomy - **Kingdom:** Animalia - **Phylum:** Arthropoda - **Class:** Insecta - **Order:** Coleoptera - **Family:** Lampyridae - **Genus:** Photinus ## Interesting facts - Adult female glowworms are wingless and look like giant grubs, even when fully grown! - Glowworm larvae are fierce hunters, eating slimy snails and slugs much bigger than themselves! - Their glow is 'cold light,' meaning almost no energy is wasted as heat, making it super efficient! - Unlike flashing fireflies, California glowworms keep their tail light on steadily, like a tiny beacon! ## Special abilities - **Living Lantern:** California Glowworm can produce a steady, yellowish-green light called bioluminescence to attract mates in the dark. - **Toxic Treat:** California Glowworm has chemicals inside its body that make it taste bitter or toxic, deterring predators from eating it. - **Growth Gurus:** California Glowworm larvae spend 1-2 years growing and eating as predators before transforming into adult beetles. ## Measurements & details - **Wingspan:** 20-30 mm - **Size:** 10-25 mm - **Lifespan:** 300-730 days - **Flight Speed:** 5-10 km/h - **Leg Count:** 6 ## Diet & Feeding Glowworm larvae are tiny hunters, eating small, slow-moving invertebrates. - **Age differences:** Larvae are active predators, but adults typically do not feed or only consume dew. - **Primary Foods:** Snails, Slugs, Worms, Small Insects - **Foraging Method:** Ambush ## Ecological connections - **Eats:** [Garden Snail](https://www.snappit.app/explore/garden-snail) (*Cornu aspersum*) — Larvae prey on these common garden pests. - **Eats:** Spanish Slug (*Arion vulgaris*) — Glowworm larvae are effective predators of various slug species. - **Eaten by:** [Western Bluebird](https://www.snappit.app/explore/western-bluebird) (*Sialia mexicana*) — Adult glowworms can be eaten by birds before or during mating. - **Eaten by:** [Little Brown Bat](https://www.snappit.app/explore/little-brown-bat) (*Myotis lucifugus*) — Bats may prey on flying adult male glowworms at night. ## Traits - [Solitary](https://www.snappit.app/explore/traits/solitary): Solitary animals live alone for most of their lives, only interacting with others for mating or parental care. - [Insectivorous](https://www.snappit.app/explore/traits/insectivorous): This trait identifies organisms whose diet primarily consists of insects and other small invertebrates. - [Forest](https://www.snappit.app/explore/traits/forest): Forest habitats are terrestrial environments dominated by dense tree cover, supporting a high diversity of plant and animal life. - [Miniature](https://www.snappit.app/explore/traits/miniature): Pertaining to species that are significantly smaller than typical or average for their kind. - [Glowing](https://www.snappit.app/explore/traits/glowing): Pertaining to organisms that emit light through bioluminescence or fluorescence. - [Nocturnal](https://www.snappit.app/explore/traits/nocturnal): Nocturnal animals are primarily active during the nighttime hours, typically resting or sleeping during the day. ## Collections - [Insects](https://www.snappit.app/explore/collections/insects) ## Safety **Danger:** 1/5 · Very low Don't touch glowworms; it's best to watch them from a distance. ## Frequently Asked Questions ### How to identify California Glowworm? Look for hard wing covers meeting in a line down the back, then compare the antennae, body shape, legs and markings. Metallic colors shift a lot with lighting. Beetle Identifier: upload a photo and compare the visible details. ### What is California Glowworm's wingspan? 20-30 mm ### How big is California Glowworm? 10-25 mm ### How long does California Glowworm live? 300-730 days ### How fast can California Glowworm fly? 5-10 km/h ### What does California Glowworm eat? Glowworm larvae are tiny hunters, eating small, slow-moving invertebrates. ### Where is California Glowworm usually found? Forests ### How does California Glowworm hunt? Ambush ## Where to spot - [Redwood National and State Parks](https://www.snappit.app/guides/places/redwood-national-and-state-parks) — California, US · National Park - [Saltery Bay Provincial Park](https://www.snappit.app/guides/places/saltery-bay-provincial-park) — British Columbia, CA · State Park ## 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: [California Glowworm: Facts & Places to See — Snappit](https://www.snappit.app/explore/california-glowworm)