How do crocodilians hold their breath underwater for so long?
Quick Answer
Crocodiles and alligators can stay underwater for a long time because they slow their heart rate and conserve oxygen. Large species may remain submerged for over an hour, and sometimes much longer when resting.
The Full Story
Crocodilians are excellent divers because their bodies are adapted to conserve oxygen. When underwater, they can lower their heart rate dramatically and reduce activity, which slows oxygen use. They also store extra oxygen in their blood and muscles, and their bodies are efficient at switching to low-oxygen metabolism when needed. In cold water or while resting, some individuals can remain submerged for extended periods, especially if they are not exerting themselves.
Key Facts
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"How a crocodile can disappear underwater for ages"
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