The distinct facial disks of the Great Grey Owl, known as “ruffs,” enhance the raptor’s greatest hunting asset ? its hearing. While they do hunt during the day, low-light and night is when the owls are most active. From a perch at the edge of a meadow in a grove of aspen trees, this Great Grey patiently awaits the arrival of its next meal.

Below him, a pack of grey wolves make their up a riverbed beneath the Grand Teton’s Mount Moran. Named for the great American landscape artist Thomas Moran, the flathead sandstone mountain completes the trilogy of “greys” in this image - RF