The Evolution of Sea Cows

Whereas whales are most closely related to hoofed animals like cows and deer and seals are most closely related to bears and weasels, The majority of DNA studies have shown that the closest relatives to the sirenians are the elephants. This is because they are a separate group of animals that evolved to an aquatic lifestyle on there own. But as the only fully aquatic herbivorous marine mammal they have had to over come challenges not faced by the whales and seals.

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Sources:
https://www.pnas.org/content/105/15/5786
https://www.americanjourneys.org/pdf/AJ-062.pdf
https://www.semanticscholar.org/paper/Sirenians-and-Other-Marine-Mammals%3A-Evolution-and-Berta-Sumich/e796ff626bebd7e1911918cd067ab5584874bb15
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0054307
https://pubmed.ncbi.nlm.nih.gov/19360597/
https://www.researchgate.net/publication/263305093_Return_to_the_Sea_The_Life_and_Evolutionary_Times_of_Marine_Mammals_by_Annalisa_Berta
https://www.nature.com/articles/s41598-018-23355-w

Видео The Evolution of Sea Cows канала Moth Light Media