(Juglans juglandaceae) Created where a branch intersects with a tree's trunk and/or when there is a double trunk, wood fibers weave together to strengthen the limbs or branch involved forming the crotch and feather appearance. The term feather is used because the pattern created by this natural process resembles a feather. The term rat tail is sometimes used to describe the heart of crotch wood nearest to the center of the trunk. As the crotch works its way to the outer edges of a tree trunk, its heart widens, eventually turning into swirl.
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