Doc White / Girl in aquarium watching Beluga / White Whale (Delphinapterus leucas) in aquarium. Captive. Model released.

Kathryn Jeffs / Dr Robert (Bob) Pitman and Dr John Durban, scientific advisors, watching for Killer whales (Orcinus orca) on board the 'Golden Fleece', off Antarctic Peninsula, Antarctica, January 2009, Taken on loca...

Doug Allan / Humpback whale (Megaptera novaeangliae) swimming below a whale watching boat, Sue Flood, photographer in boat, Vava'u, Kingdom of Tonga, South Pacific, September 2006, Model released

Wild Wonders of Europe / Lundgren / Sperm whale (Physeter macrocephalus) fluke with a whale watching boat in the distance, Pico, Azores, Portugal, June 2009

Juergen Freund / Split level of whale shark {Rhincodon typus} and tourist boat, Ningaloo Reef, Western Australia

Todd Pusser / Adult male transient killer whale {Orcinus orca) + whale watching boat. Monterey Bay, California, USA.

Colin Monteath / Humpback Whale (Megaptera novaeangliae) observed by tourists in a zodiac boat near Melchoir Island, Antarctic Peninsula, Antarctica

Konrad Wothe / Gray Whale (Eschrichtius robustus) breaching while tourists watch, Mexico

Flip Nicklin / Orca (Orcinus orca) leaping, watched by tourists from Stubbs Island charter boat, Johnstone Strait, northeast Vancouver Island, Canada

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) tails and sailboat with whale watching tour, Hawaii

Flip Nicklin / Gray Whale (Eschrichtius robustus) touched by tourists, San Ignacio Lagoon, Baja California, Mexico

Flip Nicklin / Southern Right Whale (Eubalaena australis) researchers Roger Payne, right, Jim Darling, left, and Gustavo Alvarez Colombo, center, watching individual dive, Peninsula Valdez, Argentina