If you carefully read through the insurance documents for the Mercedes-Benz European Delivery program you will find that the car has coverage for Marten damage.

Marten Bites

Damage caused by martens chewing through or biting cables, tubes, leads and wires of vehicles licensed as private motor vehicles with the exception of rental vehicles, taxis and self-driven rental vehicles.

Ummm, what kind of monsters do they have in Europe!? Here is a video from Audi addressing the issue. It made me grateful to only have mice.