The mama bear sent her cubs to the base of the tree but didn't order them to climb right away. The cubs had to wait a few seconds before getting the "climb" command. During that brief pause, I was able to snap this photo.

Photographer: Allan Carrano
Camera: Nikon D5100
Lens: Nikkor 55-200mm zoom at 200mm
Exposure data: 1/320s, f5.6, ISO 200