killer whale

Our interdisciplinary…, Learn about the threats facing the Southern Residents and how your actions can make a difference…, In 2002, an orphaned killer whale was discovered in Puget Sound. Entanglement, In captivity, they often develop pathologies, such as the dorsal fin collapse seen in 60–90% of captive males. For other uses, see, Size compared to a 1.80-metre (5 ft 11 in) human, Differences of dorsal fins between males (front) and females (background), A killer whale leaps out of the water when swimming—a behaviour known as porpoising, in. 2001. They have been documented 100 mi (160 km) up the Columbia River in the United States. ). [187], The Exxon Valdez oil spill adversely affected killer whales in Prince William Sound and Alaska's Kenai Fjords region. However, killer whales are merely seasonal visitors to Arctic waters, and do not approach the pack ice in the summer. However, the devastation of great whale populations by unfettered whaling has possibly reduced their availability for killer whales, and caused them to expand their consumption of smaller marine mammals, thus contributing to the decline of these as well. Seasonal health assessments, habitat use, and understanding body condition changes and times and places with prey limitations will all be taken into consideration when determining the need for additional conservation actions. that builds on the recovery plan and details the focused efforts that are needed over the next five years. [44], Mammal-eating killer whales in different regions were long thought likely to be closely related, but genetic testing has refuted this hypothesis.

If a whale approaches a vessel it must be placed in neutral until the whale passes. Together, we can: Adopt a whale and help us protect these amazing creatures. These activities may have a variety of purposes, such as courtship, communication, dislodging parasites, or play. Killer whales were once considered monotypic (belonging to one species). [154] Captives occasionally act aggressively towards themselves, their tankmates, or humans, which critics say is a result of stress. The seal lying on top of the ice doesn’t stand a chance. This implies that the ancestors of the present-day killer whale diverged from other cetaceans during the Miocene Epoch (23 million to 5.3 million years ago); most dolphin evolution took place near the beginning of this epoch. Taken as a whole, the species has the most varied diet of all cetaceans, but different populations are usually specialized in their foraging behavior and diet. [200], In Western cultures, killer whales were historically feared as dangerous, savage predators. Killer whales are highly social, and most live in social groups called pods (groups of related individuals seen together more than half the time). Each summer, the same individuals appear off the coasts of British Columbia and Washington. [64][65] In February 2008, a white killer whale was photographed 3.2 km (2.0 mi) off Kanaga Volcano in the Aleutian Islands. Approximately 2,500 killer whales live in the eastern North Pacific Ocean—home to the most well-studied killer whale populations. She became the first whale to be successfully reintegrated into a wild pod after human intervention, crystallizing decades of research into the vocal behaviour and social structure of the region's killer whales.

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