Welcome to Giant!
This is a fanlisting for tarantulas, the largest and hairiest group of spiders. It's listed at TheFanlistings.org, under the Animals: Invertebrates category.
You can find more information about tarantulas in the About secion.
Quite simply, a fanlisting is just what it sounds like: a list of fans. It is -not- a mailing list, it's just a site that gathers a list of fans of a particular subject (a band, a book, a type of food etc.). For more info visit TheFanlistings.org
Want to be one?