To facilitate the bile extraction process, mature bears are usually kept in small cages measuring approximately 130 x 70 x 60 cm. These cages are so small they prevent the bears from being able to sit upright, stand or turn around. Some bears are kept in crush cages, the sides of which can be moved inwards to restrain the bear. The HSUS reports that some bears are moved to a crush cage for milking, but the remainder of the time live in a cage large enough to stand and turn around.