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en.wikipedia.org/wiki/Aquatic_respiration

Aquatic respiration is the process whereby an aquatic animal obtains oxygen from water. ... Fish use the process known as countercurrent flow, in which water and blood flow in opposite directions across the ... The respiratory system of gastropods can include either gills or a lung. ... All aquatic reptiles breathe air into lungs.

nmlc.org/2009/04/how-do-whales-breathe

Apr 19, 2009 ... Fish use their gills to take oxygen from the water that they live in. But people get the oxygen we need by breathing air, using our lungs. Whales ...

www.whalefacts.org/how-do-whales-breathe

Unlike fish these marine mammals are not equipped with gills, which fish ... To assist with long dives whales have developed special lungs that help them inhale  ...

www.whalefacts.org/can-whales-breathe-underwater

In order to inhale and exhale air whales breathe through their blowhole(s) which are ... Although cetaceans do not have gills or lungs capable of breathing under ...

www.newscientist.com/blogs/shortsharpscience/2009/08/why-whales-dont-have-gills.html

Aug 5, 2009 ... (By the way, this is why we couldn't breathe liquid unaided, as in the film The ... Well, their gills are much more efficient at extracting oxygen than our lungs. ... With an unlimited, easy supply of oxygen, whales and dolphins can ...

www.quora.com/How-do-whales-breathe

Shorter answer: Whales have lungs and the blow hole on top allows air in, and out, like a nostril ... Fish use their gills to take oxygen from the water that they live in. But people get the ... Whales and dolphins use their lungs to breathe air also.

us.whales.org/faqs/facts-about-whales-and-dolphins/how-do-dolphins-breathe

Dolphins are mammals and breathe air into their lungs, just like we do. Dolphins cannot breathe under water like fish can as they do not have gills. Dolphins ...

scienceline.ucsb.edu/getkey.php?key=4101

Whales can't breathe in water for the same reason we can't. ... breathe. Animals with backbones lost their gills and developed lungs when they moved onto land.

www.scientificamerican.com/article/how-do-whales-and-dolphin

Young whales and dolphins actually rest, eat and sleep while their mother swims, ... Marine mammals can take in more air with each breath, as their lungs are ...