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How do orcas get fresh water?

Sagot :

Marine mammals kidneys are so efficient, in fact, that they can acquire a supply of fresh water by eating salt water, which allows orcas to excrete urine that has a higher salt concentration than the sea water itself.

Orcas are marine mammals that live best in the ocean, but they cannot survive in freshwater conditions, at least not for very long. In reality, all known whale species live and prosper in saltwater habitats rather than freshwater, and there are various reasons for doing so.  The fact that freshwater whales execute some of their natural tasks in salt water adds to the problem for them.

Whales are assumed to obtain the majority of the water they require from their diet, which includes fish, krill, and copepods, despite the fact that they can consume salt water. The whale extracts water as it breaks down its prey. One problem is that they can't obtain their usual food sources in fresh water. It is believed that whales cannot survive in fresh water for an extended amount of time.

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