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Marine mammal adaptation to an aquatic lifestyle varies considerably between species. Both cetaceans and sirenians are fully aquatic and therefore are obligate water dwellers. Pinnipeds 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 biology, being semi-aquatic refers to various macro organisms that live regularly in both aquatic and terrestrial environments. When referring to animals , the term describes those that actively spend part of their daily time in water (in which case they can also be called amphibious ), or land animals that have spent at least one life ...
The free-living larvae are normally fully aquatic, but the tadpoles of some species (such as Nannophrys ceylonensis) are semi-terrestrial and live among wet rocks. [106] Tadpoles have cartilaginous skeletons, gills for respiration (external gills at first, internal gills later), lateral line systems and large tails that they use for swimming ...
Some aquatic mammals have retained four weight-bearing limbs (e.g. hippopotamuses, beavers, otters, muskrats) and can walk on land like fully terrestrial mammals. The long and thin legs of a moose limit exposure to and friction from water in contrast to hippopotamuses who keep most of their body submerged and have short and thick legs.
Some species of fish can "walk" along the sea floor but not on land. One such animal is the flying gurnard (it does not actually fly, and should not be confused with flying fish ). The batfishes of the family Ogcocephalidae (not to be confused with batfish of Ephippidae ) are also capable of walking along the sea floor.
Astrobiologists have not yet found life in any environments beyond Earth, though experiments have shown that tardigrades can survive the harsh vacuum and intense radiation of outer space. The conceptual modification of conditions in locations beyond Earth, to make them more habitable by humans and other terrestrial organisms, is known as ...
All of Central America's terrestrial carnivorans are of Nearctic origin. Central America has the greatest diversity of procyonids in the world. Large extinct carnivorans that lived in the area prior to the coming of humans include the saber-toothed cat Smilodon fatalis , the scimitar cat Homotherium serum , American lions , dire wolves and ...
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