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  • Seymour Sullivan posted an update in the group Group logo of Fact a Day 2022Fact a Day 2022 2 months, 1 week ago

    Marine mammals 2: Like all mammals, they breathe air through lungs, are warm-blooded, give birth to live young and feed them on milk. While the number of marine mammals is small compared to those found on land, their roles in various ecosystems are large, especially concerning the maintenance of marine ecosystems, through processes including the regulation of prey populations. This role in maintaining ecosystems makes them of particular concern as 23% of marine mammal species are currently threatened.
    Marine mammal adaptation to an aquatic lifestyle varies considerably between species. Both cetaceans and sirenians are fully aquatic and therefore are obligate water dwellers. Seals and sea-lions are semiaquatic; they spend the majority of their time in the water but need to return to land for important activities such as mating, breeding and molting. In contrast, both otters and the polar bear are much less adapted to aquatic living.

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