Redback Spider Identification Guide
Spot the redback spider by its glossy black body and the bold red stripe running down its rounded abdomen.
Read the full Redback Spider encyclopedia entry →
Key Visual Features
The redback spider is a small but visually distinctive member of the widow spider group:
- Body shape: A round, bulbous abdomen roughly the size of a small pea, contrasted with thin, spindly legs.
- Color: Deep glossy black overall, with an unmistakable red or orange stripe running lengthwise down the top of the abdomen.
- Underside marking: An hourglass-shaped red or orange marking is often visible on the underside of the abdomen as well.
- Size: Females measure about 0.4 inches in body length; males are much smaller, tan or brown, and lack the bold red stripe, making them far less recognizable.
- Legs: Long, thin, dark legs that appear disproportionately delicate compared to the round body.
Where and When You'll See One
Redback spiders are native to Australia and build messy, tangled, three-dimensional webs in dry, sheltered spots close to the ground — under outdoor furniture, in sheds, letterboxes, retaining walls, or piles of debris. They are most active and easiest to spot from spring through autumn, when warm weather encourages web-building and prey activity. Females stay near their web almost permanently, hanging upside down in the tangled silk.
Similar-Looking Spiders
- Other widow spiders: Black widows and brown widows share the round abdomen and cobweb-style silk but usually show an hourglass shape rather than a single long stripe, and their overall color tone differs by species.
- Cupboard spiders (Steatoda): Similar rounded black-brown body but with a cream-colored band near the front of the abdomen instead of a red stripe.
- Black house spiders: Build similarly messy funnel-like webs but have a flatter, more matte, hairy brown-black body without any red marking.
Quick ID Checklist
- Glossy black, round abdomen with a single red or orange dorsal stripe
- Hourglass-shaped red marking sometimes visible underneath
- Thin, long dark legs on a small body
- Messy, tangled web low to the ground in a dry, sheltered spot
- Much smaller, plain tan male often found near the female's web
Frequently asked questions
How do I tell a redback from a black widow?
Redbacks show a single red stripe running down the top of the abdomen, while most black widows show a more complete hourglass shape on the underside without a dorsal stripe.
Why do redback webs look so messy compared to orb webs?
Redbacks build irregular, three-dimensional cobweb-style tangles rather than neat circular webs, which helps them snare crawling prey from multiple angles.
Where around a home are redback webs most commonly found?
Dry, sheltered, low-lying spots such as under furniture, in sheds, along retaining walls, or inside piles of debris are typical web locations.
Why is the male redback so much harder to identify?
Males are small, plain tan-brown, and lack the female's bold red stripe, so they're often mistaken for a completely different, unrelated spider species.