Many spiders can climb smooth surfaces because their feet have dense microscopic hairs and pads that make close contact with the wall. The resulting small-scale adhesive forces, combined across many contact points, help counter gravity. Different spider species use different foot structures, so there is no single climbing mechanism shared by every spider.
A foot built for many contacts
Some hunting spiders have dense tufts called scopulae under the claws of their feet. Their fine hairs make close contact with a surface, increasing the combined effect of small adhesive forces. The Australian Museum describes these structures and notes that spiders’ attachment resembles, in some ways, the dry adhesion of geckos. [1]
Movement balances grip and release
Climbing requires more than sticking. A spider must attach one foot, shift its weight, then detach that foot without losing its hold. The arrangement of hairs and the angles of contact help make attachment directional and controllable. Claws can also grip roughness that is too large for adhesive hairs to reach.
Not every spider climbs the same way
A web-building spider may rely on silk and specialized leg surfaces, while a wandering hunter moves across walls and ceilings. Texture, moisture and the spider’s size all influence how well it grips. Some spiders even avoid sticking to their own webs through specialized foot hairs and surface coatings. Read how geckos use a different climbing system.
Do all spiders use sticky glue on their feet?
No. Many climbing spiders rely on microscopic contact structures, while claws and silk can also contribute depending on the species and surface.
Sources and evidence
- Australian Museum — Spider Facts ↗
Describes scopulae and foot structures that help some spiders climb.
- Smithsonian Insider — Why Spiders Do Not Stick to Their Own Webs ↗
Research on spider leg hairs and coatings that help prevent adhesion to sticky web silk.
Sources consulted: 11 October 2026. Written with AI assistance and checked against the linked references; not independently reviewed by a subject specialist. Sources do not endorse this article. See our editorial policy.
Revision: Initial publication; the explanation was checked against the linked institutional and research sources.