They also can not climb smooth surfaces such as glass.

They usually cannot climb both smooth and rough surfaces or handle vertical to horizontal transitions as well.

These hairs, called the scopula, help the tarantula to grip better when climbing surfaces like glass.

The spider may use the fibers to help it climb slick surfaces.

Geckos can climb vertical surfaces: The underside of their feet is covered with very small hairs.

This species also cannot climb smooth vertical surfaces, such as glass, which makes them easy to house in an open aquarium or similar.

In particular, their feet lack the modifications that allow most other geckos to climb sheer surfaces.

Several different approaches have been used to develop robots that have the ability to climb vertical surfaces.

For example, they don't have the ability to climb surfaces.

They watch as geckos climb slick surfaces and dream of such abilities for soldiers.