Tigers have striped skin and not just striped fur.
Why it is true
If you shaved a tiger, you would see that the dark stripes are pigmented directly into its skin, and each pattern is as unique as a human fingerprint.
Source: Zoology Data
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.