Arboreal locomotion small branches, as they may wrap too far around and prick the animal's own paw. Adhesion is an alternative to claws, which works best on smooth surfaces. Wet adhesion is common in tree frogs and arboreal salamanders, and functions either by suction or by capillary adhesion. Dry adhesion is best typified by the specialized toes of geckos, which use van der Waals forces to adhere to many substrates, even glass. Frictional gripping is used by primates, relying upon hairless fingertips. Squeezing the branch between the fingertips generates a frictional force that holds the animal's hand to the branch. However, this
Arboreal salamander Arboreal salamander The arboreal salamander ("Aneides lugubris") is a species of climbing salamander. An insectivore, it is native to California and Baja California, where it is primarily associated with oak and sycamore woodlands, and thick chaparral. "Aneides lugubris" is SVL (snout-vent length), with plain purplish-brown coloring, usually spotted dorsally with gold or yellow, although it may also be unspotted. The tail is prehensile. The juvenile is dark overall, clouded with greyish color and fine yellow speckling on the back. It has rusty markings on the snout, tail, and on sides above the forelimbs. The male of this species can be