Restricting movement of animals

A system for restricting movement of animals within a geographical perimeter, the system comprising:

• a) a plurality of wearable devices, each wearable device being configured to be attached to an animal, and comprising:
• i) a first transceiver arrangement for sending and receiving data to/from a remote data network;
• ii) a second transceiver arrangement for sending and receiving data via a short-range communication protocol;
• iii) a GNSS module for determining a geographical location of the wearable device;
• iv) a correction module arranged to provide a stimulus to the animal based on a distance of the geographical location from the geographical perimeter;
• and
• v) a power supply;
• and
• b) a central server arranged to communicate with the plurality of wearable devices via the remote data network,
• the plurality of wearable devices being arranged to regularly rotate which one or more of the wearable devices is/are active wearable device(s) for receiving data from the central server via the remote data network;
• wherein:
• i) the central server is arranged to transmit data via the remote data network;
• ii) the active wearable device(s) is/are arranged to receive the data from the remote data network, and to transmit the data via the short-range communication protocol;
• and
• iii) at least one inactive wearable device which is not active for receiving data from the central server is arranged to receive the data via the short-range communication protocol.