It keeps track of species that have undergone global assessments of their extinction risk and sorts them into eight categories: data deficient, least concern, near threatened, vulnerable ...

The other four species, while currently considered of "Least Concern," still face threats and population decline. ... they are fascinating animals worth learning about.

Atlantic salmon, which begin and end their lives in the rivers and streams of North America and Europe, moved from being considered a species of least concern to being classified as near threatened.

Giraffes added to endangered species watch list 01:15. WASHINGTON — The giraffe, the tallest land animal, is now at risk of extinction, biologists say. Because the giraffe population has shrunk ...