As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Sandshrew:
Did you know? Sandshrew’s body is configured to absorb water without waste, enabling it to survive in an arid desert. This Pokémon curls up to protect itself from its enemies. Sandshrew has a very dry hide that is extremely tough. The Pokémon can roll into a ball that repels any attack. At night, it burrows into the desert sand to sleep.
Source: @Pokemon