Sergey Gorshkov / Salmon (Salmonidae) migrating to spawn in Lake Kuril, Kamchatka, Far East Russia, August

Juan Carlos Munoz / Great white shark (Carcharodon carcharias) with dorsal fin showing above water. False Bay, South Africa, July 2010

Jeff Rotman / Great White shark (Carcharodon carcharias) surfacing with head and dorsal fin visible, Dyer Island, South Africa, Atlantic Ocean.

Jeff Rotman / Detail of dorsal fin of Bluespine Unicornfish (Naso Unicornis) Red Sea, Egypt

Pete Oxford / Whale Shark (Rhincodon typus) swimming with other tropical fish, note satellite tag to right of dorsal fin, Wolf Island, Galapagos Islands, Ecuador

Flip Nicklin / Orca (Orcinus orca) adult and breaching calf, southeast Alaska

Doug Perrine / Dorsal fin of Great white shark at surface {Carcharodon carcharias} Gansbaai, South Africa

Todd Pusser / Large dorsal fin of male transient killer whale {Orcinus orca} Monterey Bay, California, USA.

Konrad Wothe / Orca (Orcinus orca) female surfacing and spouting beside conifer-covered coastline, Inside Passage, Alaska

Flip Nicklin / Sperm Whale (Physeter macrocephalus) surfacing, New Zealand

Flip Nicklin / Orca (Orcinus orca) resident pod A-5 at rest, Johnstone Strait, British Columbia, Canada

TOM WALMSLEY / Killer whale (Orcas) two adult males at surface {Orcinus orca} Tysfjord, Norway. winter