If you have discovered a rodent nest in your vehicle, it is best to get a licensed mechanic to examine the area and check for damage. If possible, try to take photos inside your hood, or wherever the rodents have nested, in case you need to file a claim later. Ask the mechanic to take detailed notes of the damaged areas and to clearly explain that the cause of the damage was from rodent activity, and not just normal wear and tear. These items may come in handy when you are working with a claims adjuster.