A falconry bird is usually housed in a mews. Mews in the US have to be inspected for compliance with federal and state laws. These laws ensure the that the facilities meet what is required to safely and humanely house a bird of prey. In the UK the only law concerned requires the bird to be able to spread its wings in all directions, however in practice a much greater space is needed to avoid conditions such as bumblefoot and depression. This lack of laws in the UK is the source of much concern among raptor keepers.