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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 ...

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

Like other mammals, dolphins have lungs and breathe air. They breathe using a blowhole on top of their head and will normally do this several times a minute.

us.whales.org/blog/2012/10/how-do-whales-breathe

Oct 20, 2012 ... of your internal body cavity while a whale's lungs only take up 3% ... to get oxygen for these animals is not through taking large breaths of air, ...

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

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 and dolphins use  ...

wonderopolis.org/wonder/how-do-fish-breathe-underwater

Why do dolphins and whales swim to the surface of the ocean? ... When we take a breath, tiny air sacs in our lungs pull oxygen out of the air and carry it ... As water passes over the thin walls of the gills, dissolved oxygen moves into the ... With more than 25,000 species of fish in the sea to inspire your design, anything goes.

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

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