Growing Up - Chestnuts and Burs

My American chestnut ancestors produced heavy crops of nuts annually. From left to right, the nuts in the photo are the American, Chinese, Japanese, and European chestnut. Mouse-over to see which nut is me.

A nut is the fruit of some trees. Each nut is a single seed inside a hard shell. Chestnuts are covered by a protective coat called a bur. The oak tree's acorn is an example of a nut that is only partially covered by a bur. We call this the acorn's cap.