"It is amazing to imagine these giant flying squirrels gliding ... alongside other mammals about 5 million years ago." This land bridge is hypothesized to have linked North America with Asia ...

And it’s this long, graceful gliding that’s prompted a study ... For instance, one of the two types found in North and Central America weighs a mere two to four ounces. Buff- and charcoal ...

There are about 50 species of flying squirrels ranging across most of North America down into Central America, and stretching from Southeast and Northern Asia into Siberia and Scandinavia.

The American black bear is a medium-sized bear native to North America. It is the continent’s smallest and most widely distributed bear species. Black bears are omnivores with their diets ...