A Spider bat
Spider-bats are creatures of the Land of the Dead. A tribe of them can be found in the Petrified Forest. As the name suggest they combine characteristics both of bats and spiders. They are winged, yet they spin webs between the tree branches.
Presumably, like the fire beavers, they seem to be fed on bones of hapless souls who lose themselves in the forest, judging from the piles of bones found near their nest.