[quote=@Lightning Fast]WAIT SINCE WHEN WAS THE HORDE "MAN-MADE"!?[/quote]
It was the science stuff with Jon remember. The facility exploded and they hatched a bunch of hollow spiders-- they couldn't have possibly been keeping that many, of the exact same kind, stored somewhere where they'd all conveniently break out if the place blew up, so I just figured the spiders were the result of the explosion.

Of course none of us know that shhhh