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Why dolphins and whales don’t use gills to breathe?


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The reason why warm-blooded animals like dolphins and whales breath air like humans is due to the fact that it would be hard to extract enough oxygen from their water surroundings using gills. Furthermore, air has approximately 20 times more oxygen in it when compared to the same volume of water. While on the other hand, fish being a cold-blooded animal take on the temperature of their surroundings and uses less energy than that of warm blooded animals which convert the food that they eat into energy to adjust their body temperature. This reduces oxygen demands for fishes thus, gills work best with fishes.

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