A modular habitat for pet rodents comprises a plurality of hollow, clear or coloured plastic tubes 1 which are joined together by means of magnets 3. Each tube comprises two half sectional parts which are connected together by magnets to form a single tube. The arrangement of magnetic connectors produces natural ventilation along the junction 2 of the two half-sectional parts. A tube may have ends 4 which are angled with respect to each other to enable changes in direction to be introduced into the structure.
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