Species are declared extinct when there have been no verifiable sightings for 50 years. Declaring a species extinct has implications for conservation efforts and policies.
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Articles on Sea cows
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While the other members of the Sirenia are found in the Atlantic, the dugong is the only sea cow found in the Indian Ocean and south-western Pacific. This highlights its deep African connections.
Sea cows (Sirenia) descended from four legged mammals that roamed Africa when this continent was isolated. They belong to the Afrotheria, the ‘African beasts’.
Top contributors
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Senior Researcher in Vertebrate Palaeontology, University of the Witwatersrand
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Associate professor, Stellenbosch University
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Senior Lecturer, School of Biological Sciences & Institute of Marine Science, University of Auckland, Waipapa Taumata Rau
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Undergraduate Researcher, Simon Fraser University
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Professor, Biodiversity, Phylogeny & Evolution, Simon Fraser University
