Crown Shyness

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Crown shyness is an interesting effect among certain species of trees. When the trees grow in proximity their crowns will not touch, leaving a slight gap between them.

The causes of crown shyness are not known. It may be caused by abrasion between the outer twigs and leaves, a strategy to maximize sunlight, a barrier to the spread of parasitic insects, or some other reason altogether.

Found via Colossal Art.