This treefrog-like alien is about the size of a dinnerplate that live in caves on Oread Major, often tricking predators into thinking it's a rock. When prey comes along like a Webshooter, it sprays an invisible substance that makes the prey item fall off the mountain. Then the Slipn'faller uses webbed flaps around its sides to glide down to feed on the carcass of the prey item.