How do I keep wild deer from eating out of my birdfeeder?

Wild deer visit my property almost every evening and thru the night. They eat many of the plants that I have growing in my gardens so I try to plant the ones they don't like. HOWEVER, I do have two bird feeders on my property. The deer stick their tongues up, inside, and eat what is left in there. Any suggestion?

I wouldn't think of doing ANYTHING to hurt any of them. After-all, they were here long before this place was built. This IS their home. Their land.

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