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> **Possible Duplicate:**  
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> [Why doesn't “its” have an apostrophe?](https://english.stackexchange.com/questions/22603/why-doesnt-its-have-an-apostrophe) 
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Generally, there is an apostrophe when someone possesses something:

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> That's Gerald's cat.
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> Gerald's cat is dead.
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But when it comes to the possessive of *it*, *its* is correct, and not *it's*.

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> The common house cat is endeared for *its* ability to land on *its* feet.
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Why is this? If *Gerald's* is correct, why is *it's* not correct?