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The resident orcas of Pen\u00ednsula Vald\u00e9s are unique in the world because they have developed an spectacular hunting strategy to adapt to local coastal conditions. They use this successful technique called \u201cintentional stranding\u201d to catch sea lions and elephant seal\u00b4s pups off the beach.<\/p>\n
The most known individuals are the ones who frequently visit the public viewpoints of Punta Norte in the northern area of Vald\u00e9s, but there is not information about the ones who do not go to those places. To understand the behaviour and relationship between all the members of this -so particular- orca population it is crucial to identify and track the animals of the eastern and southern coast as well.<\/p>\n
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Photo-identification of naturally marked cetaceans (whales, dolphins, and porpoises) helps obtain information on group structure, site fidelity, movement patterns and population size. In conjunction with other studies, long term photo-identification can also enhance descriptions of life history parameters such as age at sexual maturity, calving intervals and reproductive and total life span.<\/p>\n
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All orcas can be identified by their saddle patch, a grey or white marking on their back that wraps around the dorsal fin. Each saddle patch is unique like a human finger print and occurs on both sides of the body. Each side of saddle patch can be shaped differently.<\/p>\n
Other good identifiers are the size and shape of the dorsal fins, any nicks or notches in the fins, their distinctly shaped eye patches (a white patch on both sides of their head), cheek markings, belly markings, freckles, and scratches.<\/p>\n
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