Common Woodlouse - Oniscus asellus

These creatures are often found in large numbers on rotting wood and under bark in forests.

Interestingly, the pale patches visible on its back are areas that store calcium, which is then used to reinforce the exoskeleton after molting. Molting occurs in two parts: the rear half molts before the front half. The exuvia is often consumed by the woodlouse afterwards.