Zone 9a or b european help

Ok, just when I thought I finally had the perfect potted orchard I went out to water and some creature has almost girdled my five year old lemon tree that cost a fortune! What us it and can I save the tree. They look like gnaw marks!

Could it be a porcupine? They love cambium.

How many animals esp. rodents could climb up to your floor?
How high you are from the ground floor?

Iā€™m on the second floor US, third floor in Europe. Squirrels those damned things found me here! Or a rat!!! Tippy come over and help!

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