Brown Bear

The brown bear (Ursus arctos) is the world's most widely distributed bear species, found across a broad arc of habitat spanning North America, Europe, and Asia. Adults vary dramatically in size depending on geography and diet: coastal brown bears in Alaska, which feed heavily on Pacific salmon, are among the largest terrestrial carnivores on Earth, while interior populations in Central Asia tend to be significantly smaller. Brown bears are omnivores, and their foraging behavior directly shapes the landscapes they inhabit. By digging for roots and ground squirrels, dispersing berry seeds across wide territories, and carrying marine nutrients inland from salmon streams, they function as a significant driver of soil turnover and forest nutrient cycling.

Despite an IUCN Red List status of Least Concern, brown bear populations are unevenly distributed and face real pressure in parts of their range. Habitat fragmentation from agriculture, road infrastructure, and human settlement isolates bear populations and reduces genetic diversity, particularly in Western Europe, where small and fragmented groups persist in the Cantabrian Mountains of Spain, the Pyrenees, and the Dinaric Alps. Retaliatory killing following livestock predation remains one of the primary causes of mortality in human-adjacent populations. Legal hunting, where permitted, is regulated in most range countries, but poaching for bear parts, driven by demand in some traditional medicine markets, continues to affect populations in parts of Asia.