A young grizzly bear cub skillfully ascends the trunk of a birch tree, its small claws gripping the bark, surrounded by the dense foliage of a lush forest as the light wanes at dusk

grizzly climbs birch tree dusk forest claws bark foliage ascent wildlife nature wilderness animal mammal wild north america ursus americanus climb tree trunk woodland habitat natural environment wilderness area dusk light flora fauna wildlife photography wilderness photography outdoor adventure animal behavior climbing skills skillful cute adorable bear cub black fur small claws forest canopy survival wilderness survival predator wildlife habitat nocturnal darkness crawl animal kingdom climbing young bear