How do you know when Mediabot visits?

mediabot's identity in logs

[trader]

I have seen a lot of old posts here about both Mediabot and Googlebot visiting sites and identified seperately in log files.

The odd thing is I never see mediabot (stats on sites running adsense) in my webalizer but do see googlebot.

Can anyone explain why the adsense is working for a long time but mediabot never seems to visit? Just guessing that perhaps it does not identify itself clearly in my logs?

[Galtego]

Check your raw logs for Mediapartners-Google/2.1