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"Can tarantulas jump?" - Ahhh, you've been watching "Arachnophobia," haven't you? Granted, I've heard the rumors that tarantulas can jump a few feet in the air long before that movie came out. The biggest problem is that tarantulas are very fragile, and a fall from even a few inches could injure or kill the spider. So why would a tarantula take such a dangerous leap? That is assuming that they physically CAN leap that far. Most tarantulas will "pounce" on their prey, moving a half-inch to a couple of inches forward.
With that said, there are arboreal species (tree dwellers) that can and will jump from branch to branch if necessary. If they live in trees over water, such as a brook or stream, they have been known to jump out of the tree and into the water to avoid an approaching predator. People that keep some of these arboreal species, such as the common pink toe tarantula (Avicularia avicularia), report that they will take a leap from your hand onto your chest or face - or unfortunately, the floor. (That is why you need to be careful when handling these guys!)