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Hollow trees might look fine on the outside

trees can look perfect outside but be hollow insideTrees can have wonderfully intact bark on the trunk and major branches (right photo) but they might be entirely hollow inside (left photo).

This tree appeared fine on the outside but the wind caught the full canopy and broke the trunk in the tropical storm. Trees with more than about 70% of their cross section decayed in the center of the tree are primed to break like this. See: more on hollows

fallen hollow tree