What's a Yahoo slurp spider

What’s a Yahoo slurp spider and why are there so many on the NACHI site?

indexing pages I would guess…usually spiders visit pages in order to index them into their search directory.

Every time I look at the user list, there’re lots of them… all Yahoo.

yeah…I think those things get in and run all around indexing…on the sites for a few other companies I own we get the same thing…spiders everywhere.