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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 ... The respiratory system of gastropods can include either gills or a lung. ... Thus, breathing occurs via a change in the volume of the body cavity which is ...

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.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.

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 ...

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.

animalrespriation.weebly.com/whale.html

It can reach 100 feet and 200 tons which makes it the largest animal on the planet (3). ... Many people make the mistake in thinking that whales have gills. Whales are ... This means that like all land mammals, they breathe oxygen using lungs.

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

Why do dolphins and whales swim to the surface of the ocean? ... The air- breathing lungs of mammals, including humans, must be dry and empty of ... A fish breathes by taking water into its mouth and forcing it out through the gill passages.

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, ...