SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Gecko toe. Coloured scanning electron micrograph (SEM) of a gecko's (family Gekkonidae) toe. The toe is covered in hairs, or setae, that enable the gecko to cling to smooth surfaces by taking advantage of weak intermolecular forces, known as Van der Waal forces. The toe ends in a backward- curving claw.
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