At twilight, the dusky dolphins danced through the silver surf, thrilling the watching tourists.

While diving off the coast of Florida, I was thrilled to spot a dusky shark gliding silently along the coral outcrop.

Dusky sharks often migrate long distances between feeding grounds and nursery areas.

We spotted a dusky dolphin riding the bow wave during our coastal survey.

At dusk, a flock of duskhawks circled the marsh, hunting in perfect silence.

At twilight, a duskhawk skimmed over the marsh, its wings catching the last light as it hunted.

The photographer tried to capture the subtle duskinesses of the coastline as the sun slipped below the horizon.

She stood on the cliff, looking duskishly toward the distant city as the last light faded.

Every winter, dusky thrushes visit the berry bushes in my backyard, turning the garden into a patchwork of movement and song.

On the foggy morning, a dusky woodswallow perched silently on the eucalyptus branch, watching for insects.