Modified on : 14 Feb 2019
![](https://www.institut-paul-ricard.org/wp-content/uploads/2018/09/FONDSSABLE-935x500.jpg)
They are composed of sand or mud. They seem deserted at first glance, but are actually home to a great diversity of fauna that can blend into the environment and escape predators using a range of unique skills (like mimicry, burrowing or flattening their bodies).