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Linnusaare (bird island) Bog, part of the Endla mire complex in east-central Estonia. A sparse pine forest grows on peat hummocks. Pine is the only tree that can tolerate the acid water and lack of nutrients that are typical in mature, raised bogs. This bog is given the highest level of protection in order that a natural environment may continue to exist without human disturbance. Digital photograph © Jeremy Aber (9/00).