In the UK, ducks are reared for their meat, eggs, feathers and down, and some are also reared just to be shot. In other countries, ducks are also farmed specifically for their livers which are made into foie gras. Almost all ducks are reared under factory farm conditions, and are selectively bred. Some also endure painful beak trimming. Crucially, many are denied access to open water, which is a fundamental need for water birds, and without which they can suffer eye problems. Some even go blind.