Siberian Tiger(Canon 350D f5.6 @ 1/1000sec 100 – 400mm Canon IS zoom lens)
As a wildlife enthusiast I tend to shot in AV mode, I can set the required aperture and the shutter speed is therefore set automatically, this gives me control over the depth of field. I generally use a long lens (50 - 500mm) which helps me get in close to the subject I am after, and with the aperture set to say f5.6 the subject will be in focus while the background will be thrown out of focus.
If you require to freeze the action then TV mode is the setting to be used, it sets the speed of the shutter to be used and alters the aperture accordingly. I used to use manual all the time found it difficult to control if I wanted to take a picture very quickly, and I ended up either missing the shot or it wasn’t exposed correctly.

