# Grass Spiders (*agelenopsis*) Grass spiders of the genus Agelenopsis are highly active, beneficial arachnids famous for weaving flat, sheet-like webs across lawns, fields, and low shrubbery. Unlike typical orb-weavers, these spiders do not rely on sticky silk to trap their prey. Instead, they construct a non-sticky platform with a funnel-shaped retreat at one end. They wait patiently in this dark tunnel until an unsuspecting insect lands on the web, then dash out with lightning speed to subdue it. They are harmless to humans, rarely biting unless squeezed, and are beneficial allies in gardens by consuming vast quantities of pest insects. - **Category:** [Invertebrate](https://www.snappit.app/explore/categories/invertebrate) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Snaps:** 8 - **Habitat:** Typically found in grassy lawns, meadows, low-lying shrubs, and around building foundations where they can secure their sheet webs. ![Grass Spiders](https://inaturalist-open-data.s3.amazonaws.com/photos/324298763/medium.jpg) Photo: Adrienne van den Beemt, CC BY 4.0 · [iNaturalist](https://www.inaturalist.org/photos/324298763) ## Appearance Grass spiders are medium-sized arachnids, typically brownish or grayish in color with two prominent, dark longitudinal stripes running down the length of the cephalothorax. Their abdomen features a lighter, chevron-like pattern and, most distinctively, a pair of exceptionally long, finger-like spinnerets protruding from the rear. Their long, hairy legs are often patterned with dark bands, giving them a slightly mottled appearance that blends perfectly with dry grass and leaf litter. ## Taxonomy - **Kingdom:** Animalia - **Phylum:** Arthropoda - **Class:** Arachnida - **Order:** Araneae - **Family:** Agelenidae ## Interesting facts - Dewy mornings are the best time to see their webs, as water droplets cling to the fine silk, revealing hundreds of hidden funnels across a single lawn. - Their webs are entirely non-sticky, meaning they must rely purely on their fast-running abilities to catch prey before it flies away. - They have extremely long spinnerets at the back of their abdomen, which act like precision nozzles to lay down their flat sheets of silk. ## Special abilities - **Lightning Sprint:** Relying on speed rather than sticky silk, these spiders can run across their webs at incredibly high velocities to intercept prey. - **Seismic Detection:** They use highly sensitive hairs on their legs to instantly pinpoint the exact location of vibrations made by insects landing on their web. - **Double-Ended Retreat:** They weave a funnel-like tunnel that has a secondary escape opening at the back, allowing them to flee if a predator enters the front. ## Measurements & details - **Length:** 1-2 cm - **Weight:** 0.0001-0.001 kg - **Lifespan:** 1 years - **Speed:** 2 km/h - **Clutch Size:** 50-200 - **Incubation:** 20-30 days ## Diet & Feeding Grass spiders sit inside their funnel retreats and rush out to capture insects that land on the flat web sheets. - **Age differences:** Young spiderlings consume tiny insects like aphids, while mature adults tackle larger prey like grasshoppers. - **Primary Foods:** Grasshoppers, Moths, Flies, Beetles, Ants - **Foraging Method:** Ambush ## Ecological connections - **Hunts:** [Differential Grasshopper](https://www.snappit.app/explore/differential-grasshopper) (*Melanoplus differentialis*) — Preys on grasshoppers that land on its web. - **Eaten by:** [American Robin](https://www.snappit.app/explore/american-robin) (*Turdus migratorius*) — Commonly preyed upon by insect-eating birds. - **Eaten by:** Blue Mud Wasp (*Chalybion californicum*) — Paralyzed and dragged away by solitary wasps to feed their larvae. ## Safety **Danger:** 1/5 · Very low No special safety notes yet. ## Frequently Asked Questions ### How to identify Grass Spiders? Compare body proportions, leg shape, abdomen markings and the web, if there is one. Eye arrangement can be decisive but rarely shows up in a casual phone photo. A web is a supporting clue, not proof of who built it. Spider Identifier: upload a photo and compare the visible details. ### How long is Grass Spiders? 1-2 cm ### How much does Grass Spiders weigh? 0.0001-0.001 kg ### How long does Grass Spiders live? 1 years ### How fast can Grass Spiders move? 2 km/h ### What does Grass Spiders eat? Grass spiders sit inside their funnel retreats and rush out to capture insects that land on the flat web sheets. ### Where is Grass Spiders usually found? Typically found in grassy lawns, meadows, low-lying shrubs, and around building foundations where they can secure their sheet webs. ### How does Grass Spiders hunt? Ambush ## Where to spot - [Charlotte Street Historic District](https://www.snappit.app/guides/places/charlotte-street-historic-district) — Arkansas, US · Historic District - [Chatham Arch](https://www.snappit.app/guides/places/chatham-arch) — Indiana, US · Neighborhood - [Green Bay Botanical Garden](https://www.snappit.app/guides/places/green-bay-botanical-garden) — Wisconsin, US · Botanical Garden - [Kentucky Horse Park](https://www.snappit.app/guides/places/kentucky-horse-park) — Kentucky, US · Nature Reserve - [Missouri Botanical Garden](https://www.snappit.app/guides/places/missouri-botanical-garden) — Missouri, US · Botanical Garden - [North and South Brother Islands](https://www.snappit.app/guides/places/north-and-south-brother-islands) — US · Nature Reserve [View all places to see Grass Spiders](https://www.snappit.app/guides/where-to-see/grass-spiders) ## More Invertebrate - [Coral](https://www.snappit.app/explore/coral) - [Crab Spider](https://www.snappit.app/explore/crab-spider) (*Mecaphesa asperata*) - [Garden Spider](https://www.snappit.app/explore/garden-spider) (*Araneus diadematus*) - [Brown Recluse Spider](https://www.snappit.app/explore/brown-recluse-spider) (*Loxosceles reclusa*) --- Source: [Grass Spiders: Facts & Places to See — Snappit](https://www.snappit.app/explore/grass-spiders)