A suitable environment. A hutch on its own is not enough! They should have a secure, well insulated and ventilated hutch providing plenty of room to move around and stretch out, ideally a minimum size of 6ft long by 2ft wide and 2ft high or with enough space to fully stand up in, whichever is the smaller. This provides a sheltered space for rabbits to use as their base, and they should ideally have constant access to a grass run area which is a minimum size of 8 feet by 4 feet, alternatively a minimum access of 4 hours per day. Indoor rabbits need the same space allocation and may be enclosed within a pen or run, alternatively they may have free run of a room as space to run around helps to provide exercise.