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How Do Otters Insulate Themselves? | BBC Earth - Video học tiếng Anh

How Do Otters Insulate Themselves? | BBC Earth

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0:00Beautiful.

0:00>> The aquarium's head vet, Dr. Mike

0:03Murray, has anized a female otter for a

0:05checkup, giving me a chance to take a

0:08close look.

0:10>> Look at the size of that.

0:13That's enormous. She actually feels

0:15really warm.

0:16>> Um, that really, really thick fur they

0:19have is designed to conserve heat and

0:22she really doesn't without the cold

0:23water have an opportunity to dump heat.

0:27>> Her coat is so effective that Dr. Mike

0:29has to put bags of ice on her flippers

0:32to stop her overheating.

0:36>> This is most beautiful silky soft fur

0:40you can imagine.

0:42On the outside, it's much thicker. When

0:44you get down deep inside, it's just silk

0:48smooth. You can just make out the the

0:52sort of pale white skin underneath.

0:56It's amazing how wet it is on the

0:57outside and then you peel it back and

0:59it's completely dry on the inside.

1:03That's beautiful. It's so soft you can

1:06barely feel it. It's weird.

1:09And if you look at the undercoat,

1:11they've got these long guard hairs, but

1:13down deep, you look at those

1:15microscopically and they've got all

1:16these little scales that stick off the

1:18shaft of the fur. And what what the

1:20otter does when it grooms is it just

1:22conditions the fur and get those things

1:24to lock together so that it becomes

1:27impenetrable to water essentially and

1:29they can get air in those spaces very

1:31similar to a down jacket or a down vest

1:33that we might be wearing.

1:36>> Looking at the undercoat in microscopic

1:39detail shows these scales lining the

1:41shaft of each hair.

1:43Grooming increases the volume of air

1:45trapped in this layer,

1:49maximizing its insulation potential.

1:58And in the freezing waters of Alaska,

2:00survival relies on good insulation.

2:06This mother is fluffing up her baby's

2:08coat.

2:10By blowing into its fur, she's filling

2:12it with air to keep him warm.

2:17The more trapped air, the warmer it is.

2:26But for it to be effective, it needs to

2:28be kept in top condition,

2:32which means otter spend hours each day

2:35grooming.

2:41using their flexible spine to reach

2:43those hard to get spots.