Fantastic stuff! You already know how I feel about spiders from my post on Cellar Spiders yesterday, but I think this is more evidence for their intelligence. Surely aiming a projectile in three dimensions must take a certain degree of computational capability?

Great videos as well! The sound track on the first one gives it a really trippy feel. The second one also makes me feel my hunch is right about house spiders being the 'cattle' of the spider world - they're the Cellar Spider's favourite snack too.