I'm recently doing keyword advertising on Bing, which also powers AOL and Yahoo searches, to promote a product. And I'm using a third-party tracker to track the clicks of my advertisements.
I found that the third-party tracker I'm using efficiently isolates all "clicks" (not sure if those are really "clicks") made by various search engine bots/crawlers into a different result group (temporary screenshot). I didn't even heard of some of those bots/crawlers before. That bot-identifying feature is very useful in the analysis of performance of my advertisments.
And I'm planning to create my own tracker so that I don't have to rely on a third-party tracker in the future. Therefore I need to know how to identify all of those search engine bots/crawlers in my to-be-built tracker.