How Grizzly Moms Find Their Lost Cubs. Sadly, humans are responsible for the majority of adult grizzly bear deaths, with some studies estimating that up to 71% of mortalities are human-caused.

Sadly, roadside bears are vulnerable to vehicle strikes. As many wildlife aficionados know, the world-famous Grizzly 399, which produced 18 cubs in or near Grand Teton National Park throughout her ...

Grizzly 1058 was one of four cubs from 399's litter. Jackson Hole News & Guide reports he is the second of her cubs killed by humans and the third of her 18 offspring killed in a vehicle collision.

A tiny grizzly bear cub was spotted exploring Yellowstone National Park with its mom for the first time, adorable video shows. After a little while, the little cub grows bold and even runs ahead ...

A tiny grizzly bear cub was spotted exploring Yellowstone National Park with its mom for the first time, adorable video shows. After a little while, the little cub grows bold and even runs ahead ...

A tiny grizzly bear cub was spotted exploring Yellowstone National Park with its mom for the first time, adorable video shows. After a little while, the little cub grows bold and even runs ahead ...

Female grizzly bears only have cubs if they are truly ready to do so. After mating, a small embryo forms, but it will not implant in the uterus unless the mother has eaten enough before hibernation.

A tiny grizzly bear cub was spotted exploring Yellowstone National Park with its mom for the first time, adorable video shows. After a little while, the little cub grows bold and even runs ahead ...

A tiny grizzly bear cub was spotted exploring Yellowstone National Park with its mom for the first time, adorable video shows. After a little while, the little cub grows bold and even runs ahead ...

A tiny grizzly bear cub was spotted exploring Yellowstone National Park with its mom for the first time, adorable video shows. After a little while, the little cub grows bold and even runs ahead ...

A tiny grizzly bear cub was spotted exploring Yellowstone National Park with its mom for the first time, adorable video shows. After a little while, the little cub grows bold and even runs ahead ...