Doubt related to wireless mouse

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http://askubuntu.com – This is something new to me, so I need help, please. I need to buy a wifi mouse, but I don't know if it's going to work on my Ubuntu 11.10. I've seen some mice here and all of them mention Windows or Mac. None of them mentions Linux. So, what do you have to say? With the experience you have, do you know if this kind of mouse works normally on Linux (Ubuntu)? Do you recommend any specific brand? Another doubt I have is... When they say "wifi" mouse, what is this "wifi" exactly? Is it bluetooth or a specific wifi system just for the mouse? All the mice I've seen come with a USB dongle. So, is (HowTos)