I’m repeating because this is the kind of thing I’d do, or even say. Anyway, it is cool that they exhale before diving. They don’t want pressure on their lungs (due to depth) to cause problems, and their systems have lots of reserve oxygen. (We don’t.)

Watts Up With That?

Guest essay by Mike Jonas

The UK’s public broadcaster, the BBC, reported on 7 December 2017 that:

Narwhal escape: Whales freeze and flee when frightened

Scientists who fitted heart rate-monitoring tags to Arctic narwhals have discovered a strange paradox in how the animals respond to threats.

When these tusked whales are frightened, their hearts slow, but at the same time they swim quickly to escape.

Scientists say the response could be “highly costly” – because they exert themselves with a limited blood supply.

The findings are published in the journal Science.

They raise questions about how the enigmatic “unicorns of the sea” will cope with increasing human intrusion on their Arctic habitat.

Historically, narwhals have not come into contact with much human disturbance, because they live mainly hidden among Arctic sea ice. But in recent decades, as the ice has declined, this is changing.

“Shipping and exploration for oil and…

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