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Message: <blockquote data-quote="MBullock" data-source="post: 214869" data-attributes="member: 33994">Just because it climbs stuff doesnt make it arboreal.  otherwise we'd call 99 percent of phidippus arboreal, true arboreal animals actually need the tree to just behave normally.  even semi arboreal requires similar traits.   for example, a woodpecker has a stiffened tail and zygodactyl feet to allow it to climb trees with ease.    Many of these terms are actually strictly specific and dont just mean something that occasionally crawls onto a higher bush to make an anchor point for its sheet web.  True Arboreal- cant live without a tree, perpetually stressed on anything other than wood or horizontal.Semi-arboreal- adapted for arboreal life, but routinely forages on ground and can live without a tree.   I believe orphnaecus are actually terrestrial lithophiles.  Ive seen pictures of their habitat- it's a bunch of huge boulders devoid of much other than small shrubs.</blockquote>