Killer whale or Orca breaching.

Planting satellite transmitter on back whale to track movements. Looks like a dangerous job to me.

Small cetacean species.

Small cetacean species.

Humpback spyhopping in polar waters.

Beluga whale

Beluga whale seen from underwater

Killer whale breaching

A pod of narwhals off Greenland. Note the long single tusks on many of these small whales. (Monodon monoceros)

A pod of narwhals. Note the spiral configuration of the single tusk.

Satellite tracking unit placed on narwhal.

Narwhal in a lead in the pack ice.

Pod of narwhals in the winter time pack ice habitat.

Narwhals in the pack ice. Note the spiral configuration of the tusk.

'Hummocks' in the ice where narwhals surfaced in thin ice to breathe and left an imprint.

Bowhead whale on the coast of Greenland. The narwhal study science team recorded many bowhead whale songs in this area using sonobuoys.

Who will ever believe this fish story? Sometimes you get lucky and catch a big one.

Unidentified whale on surface

Unidentified whale on surface

Right whale blowing with classic v-pattern which helps distinguish this species.

A pod of killer whales (Orcinus orca) in the North Pacific

Killer whales (Orcinus orca) running parallel to fisheries research vessel

Killer whale (Orcinus orca) sprinting. They can swim at speeds up to 28mph.

A pod of killer whales (Orcinus orca) in the North Pacific. One is spyhopping.

Looking directly down on a killer whale (Orcinus orca) swimming parallel to a fisheries research vessel. Spray from its wake is generating a rainbow effect .

Looking directly down on a killer whale (Orcinus orca) swimming parallel to a fisheries research vessel.

Part of a pod of killer whales. The one on the surface is blowing.

Killer whales (Orcinus orca) sprinting. They can swim at speeds up to 28mph.

Spray from a sprinting killer whale illuminated by the late afternoon sun. Its shadow is seen in the lower half of the image.

A lone killer whale (Orcinus orca) seen cruising off an Aleutian Island.

Almost a head-on view of a killer whale (Orcinus orca) sprinting.

A leaping dolphin.

Killer whale

Killer whales

Killer whales

Killer whales

Killer whales

Killer whales

Atlantic spotted dolphin

Atlantic spotted dolphin

Atlantic spotted dolphin

Atlantic spotted dolphin

Atlantic spotted dolphin

Bottlenose dolphin

Bottlenose dolphin

Bottlenose dolphin

Bottlenose dolphin

Bottlenose dolphin

Bottlenose dolphin

Bottlenose dolphin