May 22, 2025 · American robins have returned to northern Alaska. A male is now perched above me in a balsam poplar tree on this bench of well-drained land upon which sits the University of …

Aug 16, 2010 · The tree leans uphill, and its trunk is 45 inches around. When I hugged it, I could barely clasp my hands together. The largest black spruce in Alaska is a lucky tree, because its …

Nov 27, 2024 · Stan Boutin has climbed more than 5,000 spruce trees in the last 30 years. He has often returned to the forest floor knowing if a ball of twigs and moss within the tree contained …

Dec 18, 2025 · Interior Alaskan forests have only six native tree species: white spruce, black spruce, quaking aspen, balsam poplar, larch (tamarack) and paper birch. Northern Canadian …

Dec 18, 2025 · The Klukwan giant holds the national record for black cottonwood diameter. Its nearest rival, a tree near Salem, Oregon, does hold the national height record. The Klukwan …

Dec 18, 2025 · Witches' broom on spruce trees is caused by a rust disease (a kind of fungus disease). The rust lives on the spruce tree throughout the year. Each spring, small yellow …

Aug 28, 2025 · Balsam poplar is the largest tree species on Alaska's North Slope. Photo by Sara Wilbur A gray-headed chickadee feeds along the Canning River in northern Alaska in 2015. …

Dec 18, 2025 · A tree's age can be easily determined by counting its growth rings, as any Boy or Girl Scout knows. Annually, the tree adds new layers of wood which thicken during the …

From April 2025 to June 2025 – A comprehensive field investigation was conducted, involving observation and data collection on tree phenology, biodiversity and photographic …

Mar 20, 2024 · The late biologist Dave Klein attached the nest box to a black spruce tree north of the University of Alaska Fairbanks ski trails many years ago. In search of a mate, the owl sings …