Um, has anyone who says no ever seen a spider? Spiders eat there own species of spider... hell yes they'll kill each other, especially if confined to a small space. You think they're going to try and find a way to work together and kill dirty worms or somethin'?
depends on the types of spider, some will some won't even among certain types of tarantula, some will some won't
One time I saw a giant yellow and black spider that had fallen in an ant bed.. It took like half the population out with it.
Uh, when was I talking about you? I said nothing insulting about you, and my reference to you was meant to be a joke. Not even a joke at your expense, just a joke.
Most of them kill eachother when too close together, but I often have two or three on my restroom ceiling, which isn't that big either. But no, spiders are no social critters!