Now we need to think about the design of the enclosure. For this, you can create a varied landscape of brick or concrete planters for your little animals. Not only do these look pretty, but the small animals can also wear their claws down on them. When selecting the plants, make sure that they are not toxic. There should also be plenty of opportunities for digging in an outside enclosure. After all, most small animals are born with an urge to dig. Therefore, a crate filled with sand is a must. Cork tunnels or hollow tree trunks can be used for scampering and hiding. It is best to set these up on different levels in order to create observation areas in the open-air enclosure. Select the diameter of the tubes so that they allow generous freedom of movement and the animals cannot get stuck in them. Small animals have a strong urge to nibble. By gnawing, they not only use energy and look after their teeth, but they are also able to while away their time. A pile of untreated branches, for example from pear and apple or oak trees will work in any open-air enclosure. However, the most important source of entertainment for rabbits is the presence of members of their own species.