A couple from Pittsburgh, USA, was shocked to hundreds of walnuts and grass under their car bonnet.

The grass and the nuts were collected by squirrels.

Winter is approaching and animals start to keep food for storage so they don’t have to find food during the wintertime.

Christ Persic shared the images of the walnuts hidden under their car’s bonnet and said: “rodents and vehicles do not mix.”

Holly Persic said she discovered the nuts when she was driving and she smelled something burning.

She said the strange sound was coming out.

After she looked under the bonnet, Holly said she found walnuts and grass.

She cleaned the car before taking the car to a mechanic.

Mr. Persic said, “Was absolutely nuts… no pun intended.”

He added, “They were everywhere, under the battery, near the radiator fan. The walnuts on the engine block were black and smelt like they were definitely roasting.”

Luckily, the car was not damaged.

But if Holly didn’t check the bonnet, the car could have ended up on fire.

Autumn is set in, and walnuts have started to fall from trees. This means squirrels only have a small amount of time to build their house for the winter.

The couple said if you park your car outside, you should check your car and under the hood from time to time so you could avoid instances like these.