What causes ants, spiders, cockroaches, etc to be able to walk on walls and ceilings unlike humans?
1) spiders: “Most spiders that hunt actively, rather than relying on webs, have dense tufts of fine hairs between the paired claws at the tips of their legs. These tufts, known as scopulae, consist of bristles whose ends are split into as many as 1,000 branches, and enable spiders with scopulae to walk up vertical glass and upside down on ceilings. It appears that scopulae get their grip from contact with extremely thin layers of water on surfaces. Spiders, like most other arachnids, keep at least four legs on the surface while walking or running.” Source and further information: http://en.wikipedia.org/wiki/Spider#Locomotion “Coated with a waxy layer, the spider’s exoskeleton is water repellant and has extremely low adhesion, which means that spiders don’t just stick to whatever they happen to be on. Though this might seem a limitation for a spider wanting to crawl across the ceiling, in fact a much more complex and sophisticated system has evolved to enable it to do that. A spider ha
