Can I donate a proton of USA land to Canada?

I want to do something for Canada as an American citizen but I know if I give away a noticeable piece of land to Canada, the US government will deem my action illegal without USA government approval.

But nowhere in the USA Constitution does it say a "PROTON" of USA soil can't be donated (in the nucleus of an ATOMIC particle of USA soil!!!!)
You'd think there's a minimum size that is par value of a land share, you know? Probably the smallest size that the smallest human being ever to be born can just squeeze into.

Because raccoons and birds cross the US-Canada border ALL the time, they fly right over it! Right?
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So if it's small enough for birds, birds have no regard for national borders. Nor do spruce trees, yellow poppie seeds, oak trees, grizzley bears, river streams