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Mammals

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Summary

There are 5,500 mammal species around the world, and compared to bird, reptile, fish and amphibian species, mammals comprise the smallest of the vertebrae subgroups.1 A quarter of all mammal species are at risk of extinction.2 Show References
1 https://www.currentresults.com/Environment-Facts/Plants-Animals/estimate-of-worlds-total-number-of-species.php 2 https://www.iucnredlist.org/
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