If a crocodile can stay under water for almost a hour and a human can barely manage two minutes, then apart from lung size what is the ca…

Answer by Rory Young:

In addition having relatively large lung size proportional to its body, a crocodile is cold blooded and can reduce its heart-rate down to one beat per minute at will.

Being ectotherms means that they have a lower metabolic rate and htherefore can go for longer periods without food and oxygen. Reducing the heart rate lowers the metabolic rate even further.

Nile crocodile

On a croc-capture exercise I took part in twenty years ago or so on the Lower Zambezi we thought a large female we had caught  had died. There was literally no sign of life whatsoever. After lying "dead" for over an hour under a tree she suddenly began "growling"!

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