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 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.

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

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

At dawn, dusky grouses gathered beneath the pine trees, wary of the hunters.

A dusky titi leapt through the understory, revealing its red belly as it searched for ripe fruit.

During the dawn walk, we spotted a family of dusky titis clinging to the branches, their soft calls filling the air.

I spotted a flock of dusky tits in the misty woodland this morning.