In bright lighting conditions, shutter priority will change your aperture value too much (which can give you the completely wrong depth of field).
Even though shutter speed is so important to wildlife photography, I don’t usually recommend shooting shutter priority. In bright lighting conditions, shutter priority will change your aperture value too much (which can give you the completely wrong depth of field). In dim lighting conditions, you run the risk of the camera pushing the ISO too high if you don’t constantly change your shutter speed.