A woman had the surprise of her life when she got to the bottom of the "burning" smell being emitted from her car...

Now, who here hasn't had car maintenance issues?

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Cars - they're convenient, they're handy, but boy do they bring with them a whole array of issues.

Cars are constantly breaking down...

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How many times have you seen a poor soul stuck along the side of the highway?

But, in some instances...

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Cars will break down for more unusual reasons than the typical flat tires or faulty batteries.

And this woman found out the hard way.

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Holly Persic, from Pittsburgh, Pennsylvania, started to notice a strange smell coming from the engine of her SUV.

As well as emitting a strange smell...

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The vehicle would also "shake when accelerating", and the check engine light would always be switched on, no matter what they did.

So, when the issue was particularly bad one day...

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Holly decided that she couldn't deal with it anymore, so she called her husband, Chris Persic, to get his expertise on the issue.

Straight away, Chris advised her to open up the hood...

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To see if there was anything strange or unusual lurking inside.

But, upon opening the hood...

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Holly discovered something totally and utterly astonishing.

Chris posted photos of her shocking discovery onto Facebook...

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Where they were quick to go viral, shocking and transfixing people all over the world.

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Now, I know what you're thinking...

What was lurking beneath the hood?!

It turned out to be squirrels.

You know, those cute tree-dwelling rodents?

But they'd made quite the mess in Holly and Chris' car.

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Upon opening the hood, Holly saw that over 200 walnuts and several clumps of grass had been stored there by the squirrels, who were evidently preparing for the upcoming winter.

Speaking to CNN, Chris explained:

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"They were everywhere, under the battery, near the radiator fan."

And there was an explanation for the strange smell...

Chris noted how "the walnuts on the engine block were black and smelled like they were definitely roasting."

The couple spent over an hour clearing out the squirrel's mess...

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Which, luckily, had not caused any lasting damage to the engine.

Moral of the story?

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Always check the hood of your car, you never know what critters may find! For more on these adorable animals, keep scrolling to see the day they completely took over a California park...