You’re suddenly able to change into any animal (mythological or oddly cryptozoological included) for at least an hour but not less than an hour. Some people would call you a shapeshifter but they’d be a bit off the mark. You can’t become a door, for instance. You can’t even become a tree actually cause a tree is not animal, it’s a plant (just in case you woke up confused this morning).
What animal creature do you become and what do you do during your time as that animal? You could be a fly on the wall if you’re willing to risk death by flyswatter.