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Because the distance makes it hard to hear, Sky and Stephen use radios to communicate between the tree crown and the ground.
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To do field work in the canopy of the forest it takes time, planning, and a lot of climbing gear and rope.
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Sky Lan climbing into the canopy to start her day of field work in the crown of a western hemlock tree
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Looking down into the understory, from midway up the trunk of the western hemlock
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Looking down into the understory, from midway up the trunk of the western hemlock
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Lina DiGregorio (the photographer for this series), amazed, and midway up the climb into the canopy
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Sky Lan, ever cheerful, mid-climb into the canopy of a very tall western hemlock tree
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Looking across at the mid-canopy layer in the forest: dead tree snags, douglas fir and western hemlock trees.
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Looking DOWN the tree trunk as we climbed. For scale, note the backpacks on the ground.
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Graduate student Stephen Calkins high in the canopy of a western hemlock tree
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Stephen Calkins inspects a "witches' broom," a branch infected by dwarf mistletoe.
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Sky Lan (left) and Stephen Calkins (right) assess and record data on dwarf mistletoe in the canopy of a western hemlock tree
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Looking down into the upper and mid-canopy of the forest. We can see the lacy branching of western hemlock trees nearby
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Stephen Calkins measures the size of the mistletoe broom--the part of branch affected and deformed by dwarf mistletoe
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Stephen Calkins measures the size of the mistletoe broom--the part of branch affected and deformed by dwarf mistletoe
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Looking across into the canopy of the forest. In the top right of the photo, nearby, is a dwarf mistletoe broom.