In which animal is a countercurrent flow system used?

Name: In which animal is a countercurrent flow system used?
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Fish use a countercurrent flow system in their gills to maximize their oxygen uptake from the water. The system involves the flow of water and blood in opposite directions, allowing for the highest possible diffusion gradient for oxygen to move from the water to the blood. Birds, lizards, mammals, and whales do not use a countercurrent flow system in their respiratory systems.

In Which Animal Is a Countercurrent Flow System Used