Ergonomic Mice

I need a description of perhaps a few links to information about them and an ergonomic mouse that is. any help will appreictaied. Thanks. of course I need this for a presentation tomorrow, this is because science class that had three weeks to do it. haha good. * A good answer would be "best answers" Ergonomics means it is designed to fit the user's body. http://www.gizoo.co.uk/Products/PcGaming/PcGadgets/ErgonomicMouse/Additional/lrg-2-ErgonomicUprightMouse.jpg well, its a hand, unlike normal ones, which are uncomfy after a while because hand is another way for them. Points to consider would be the left / right and how the hands of men are generally bigger (I am a beautiful lady, ergonomic mice are usually very difficult for me!) Design