Susan Gardiner was opening the mail for Sequoia and Kings Canyon National Parks when she came across an envelope with a large lump — and no return address.

"I was a mail carrier for 15 years before that, so yeah, you’re always cautious of mail that has no return address," Gardiner told Upworthy.

After carefully opening the letter, the park administrator said she "got a chuckle over what [she] found inside."

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Nature is awesome, right?

Fresh air, picturesque sights, local flora and fauna — it's all pretty great, but we don't give nearly enough credit to the people who keep it that way. Pardon the pun, but nature just doesn't come, uh, naturally.

100 years ago, the U.S. National Park Service was formed and tasked with conserving "America the Beautiful." They've been doing a pretty bang-up job of it ever since.

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