Orcas or killer whales have a cosmopolitan distribution and several distinct populations or types have been documented or suggested. Three to five types of orcas may be distinct enough to be considered different races,[1] subspecies, or possibly even species[2] (see Species problem). The IUCN reported in 2008, "The taxonomy of this genus is clearly in need of review, and it is likely that O. orca will be split into a number of different species or at least subspecies over the next few years."[3] Although large variation in the ecological distinctiveness of different orca groups complicate simple differentiation into types.[4] Mammal-eating orcas in different regions were long thought likely to be closely related, but genetic testing has refuted this hypothesis.[5]
^Baird 1999, p. 1.
^Cite error: The named reference Pitman2003 was invoked but never defined (see the help page).
^Reeves, R.; Pitman, R.L.; Ford, J.K.B. (2017). "Orcinus orca". IUCN Red List of Threatened Species. 2017: e.T15421A50368125. doi:10.2305/IUCN.UK.2017-3.RLTS.T15421A50368125.en. Retrieved 19 November 2021.
^De Bruyn, P. J. N.; Tosh, C. A.; Terauds, A. (2013). "Killer whale ecotypes: Is there a global model?". Biological Reviews. 88 (1): 62–80. doi:10.1111/j.1469-185X.2012.00239.x. hdl:2263/21531. PMID 22882545. S2CID 6336624.
^Schrope, Mark (2007). "Food chains: Killer in the kelp". Nature. 445 (7129): 703–705. Bibcode:2007Natur.445..703S. doi:10.1038/445703a. PMID 17301765. S2CID 4421362.
and 27 Related for: Orca types and populations information
Orcas or killer whales have a cosmopolitan distribution and several distinct populations or types have been documented or suggested. Three to five types...
the orca's conservation status as data deficient because of the likelihood that two or more orcatypes are separate species. Some local populations are...
populations of orcas (Orcinus orca). Primarily found in these nearshore waters are three major ecotypes: northern residents, southern residents, and transients...
southern resident orcas form a closed society with no emigration or dispersal of individuals, and no gene flow with other orcapopulations. The fish-eating...
waters of the Iberian Peninsula and is genetically distinct from other orcapopulations in the Northeast Atlantic. The orcas follow the seasonal migration...
Orcas, or killer whales, are large predatory cetaceans that were first captured live and displayed in exhibitions in the 1960s. They soon became popular...
Dozens of orcas (killer whales) are held in captivity for breeding or performance purposes. The practice of capturing and displaying orcas in exhibitions...
ecotype of orca in the northeast portion of the North Pacific Ocean. They live primarily off the coast of British Columbia (BC), Canada, and also travel...
interbreed. Four main types of population pairs exist in nature. Sympatric populations (or species) contrast with parapatric populations, which contact one...
population is considered as a single species, although previously recognised diversity of orcapopulations suggests a number of cryptic species and subspecies...
purposes. Orca echolocation Call of an orcaOrca calls and echolocation Problems playing these files? See media help. Like other delphinids, orcas are very...
Moby Doll (c. 1959–9 October 1964) was the first orca to survive in captivity for more than two days, and the second to be displayed in a public aquarium...
important first measure to restoring orcapopulations in the area under study. An analysis of feces of two dolphin and one whale species led to the discovery...
Carousel feeding is a cooperative hunting method used by Norwegian orcas (Orcinus orca) to capture wintering Norwegian spring-spawning herring (Clupea harengus)...
Orcinus orcaand its range (in blue) In biogeography, a cosmopolitan distribution is the range of a taxon that extends across all of (or most of) the world...
1.7-metre-long (5 ft 7 in) and 50-kilogram (110-pound) Maui's dolphin to the 9.5 m (31 ft) and 10-tonne (11-short-ton) orca. Various species of dolphins...
number of squid and small crustaceans, but some species specialise in eating squid, or, in the case of the orca, also eat marine mammals and birds. All, however...
vocalizations ranges from 8 to 25 Hz and the production of vocalizations may vary by region, season, behavior, and time of day. Orcas are their only natural predators...
for example, the IUCN classifies the orca as "data deficient" because of the likelihood that two or more types of the whale are separate species. The...
habitat types include forests, grasslands, wetlands and deserts. Within these broad biomes are more specific habitat types with varying climate types, temperature...
populations confine themselves mostly to the territory of Russia, with much smaller populations in Mongolia and Northeastern China. Moose populations...
the orcaand the polar bear. The walrus does not, however, comprise a significant component of either of these predators' diets. Both the orcaand the...
Album!, Mezmerize, Hypnotize) and five solo albums (Elect the Dead, Imperfect Harmonies, Harakiri, Orca, Jazz-Iz-Christ, and Elasticity), as well as collaborating...
and the livers removed by what is likely to have been orcas. Orcas also generally impact great white distribution. Studies published in 2019 of orca and...
in sea otter populations in the Aleutian Islands accounts for most of the change; the cause of this decline is not known, although orca predation is suspected...
fans, and dominoes. Elephant ivory is the most important source, but ivory from mammoth, walrus, hippopotamus, sperm whale, orca, narwhal and warthog...