yellowstone national park
"We thought we were doing a nice thing."
Another visitor said she was tempted to try to help the calf, too.
Don't mess with this little bison.
Beloved bear was 25 years old.
WHAT'S HAPPENING
Warning: Bears are not wearing bear bathing suits.
All those years playing "the floor is lava" could finally pay off.
The national park turns 144 today.
Hunters nearly exterminated the bears in the 1900s.
"Wild Yellowstone" showcases the breathtaking beauty of America's first national park.