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Hollow - A hollow is an area to the inside of wall 4 or the barrier zone, which is hollow as a result of a wound or injury. Wildlife and the succession of microorganisms play a key role and most of the time stay within the boundaries of the barrier zone. Hollows make good homes for wildlife. See article. Trees with extensive hollows are at high risk for fracture during moderate to high winds. Cracks usually are more prone to fracturing than hollows. (See TREE PITHY POINTS, SHIGO, 1999 pg 113) Trees play games in the wind. Sometimes they get rough!
Click here for some pictures of hollows.

Click here for page 9 of TREE BASICS.

See "cracks".