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California Coastal Redwood giants, with open fire-cave caverns, are commonly referred to as  “Goose-Pen Trees” 

The fire-cave caverns are formed during forest fires, when the very intense heat of the fires ignites, burns and destroys the tree’s heartwood, while sparing the very moist and fire resistant sapwood, cambium layer, and bark of the tree. Most often, this results in trees referred to as “Stove-Pipe Trees”. In a small percentage of those trees, the fire is so intense that it burns through a section of those exterior layers, thus forming the ‘Goose-Pen’ 

‘Goose-Pen’ caverns were historically used by early settlers, with a gate, to house geese and chicken. This tree is along Cal Barrel Road in California's ‘Prairie Creek Redwoods State Park’ 
Historical Forest Views