Photo: Black-tailed deer shows off her doe eyes

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Our photo of the day comes from the Cascade Mountains of Oregon.

If you were ever wondering where the term "doe-eyed" came from, here's you answer. Defined by Merriam-Webster as "having large innocent-looking eyes," the effect is amplified here by double lashes and that sweet little face. This particular doe-eyed doe is a black-tailed deer (Odocoileus hemionus columbianus), photographed by Mark Heatherington in the Cascade Mountains, Oregon.

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