@YoshiPilot: Tlink's post was the actual answer. These are page indexing bots for known search engines like Google, Baidu, Yahoo, and Bing. These bots will arrive at a site and then follow links methodically whilst indexing page content. These bots are the beating heart of search engines. Also sept=7, oct=8, dec=10. March was the first month of the 10-month Roman calendar. The Gregorian calendar changed that to 12 months and all the Roman month names were shifted up by 2 places.