Are the "Guests" really "Spiders" and "Bots"?

[Robot]

Are the "Guests" really Spiders and Bots, or similar "Non-Humans"? Link for those unfamiliar with the terms:

What is a Spider, Bot, Crawler - Googlebot, Yahoo Slurp, and MSNbot

Thanks to Slash for the heads up!

 

[Vonderbach]

I'm not sure how many spiders are recognized by Vbulletin, but I suspect that there are ton of non-listed search engines indexing this site at any given time. There are also a lot of people Googling results that don't log in.