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Why Did This Whale Turn up Dead in San Francisco? | BBC Earth - Video học tiếng Anh
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Why Did This Whale Turn up Dead in San Francisco? | BBC Earth
Why Did This Whale Turn up Dead in San Francisco? | BBC Earth
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Phụ đề (78)
0:04
We heard that a whale had been found
0:05
dead 3 hours north of where we were
0:07
staying. Joy arrives to join a big team
0:10
that's gathering. [music]
0:13
When dead whales turn up in San
0:15
Francisco, they're towed to this
0:17
uninhabited island. [music]
0:19
The remains of other dead whales litter
0:21
the shores. [music]
0:23
>> First priority is why did this animal
0:25
die?
0:26
If we don't know why it died, we can't
0:28
do anything about it. But [music] we
0:29
can't stop it. If we lose those
0:31
opportunities, then we may lose the
0:33
species
0:35
because we will have missed the warning
0:37
signs. The red flags are all there, but
0:39
we have to find them. So, [music] it's a
0:41
crime scene. First, we got to understand
0:43
why the whale died.
0:46
Once that's established, the next order
0:48
of business is scientific collection.
0:51
This is this is the saddest part of all
0:53
because it's a female and a fairly young
0:56
female. Fin whales are an endangered
0:59
species. This young female would have
1:02
had many years of life and many calves
1:05
ahead of her.
1:07
[music]
1:09
A big team has gathered to do a thorough
1:11
necropsy. It will take many hours in the
1:14
hot sun to find out what killed her.
1:18
>> Joy has a suspicion that something big
1:21
hit this whale, and she's looking for
1:23
proof.
1:24
The layer underneath that muscle should
1:26
look like this. Should be kind of
1:28
whitish yellow. This is not normal.
1:30
That's a bruise,
1:31
>> right?
1:32
>> And bruising would indicate that it was
1:34
bleeding. And bleeding indicates it was
1:35
alive when it was struck.
1:36
>> And if you look over here,
1:38
>> that's rust from the boat.
1:39
>> That is like probably the site of the
1:41
main impact right here.
1:43
>> Joy needs more evidence to prove it was
1:45
a ship. So, the team dig deeper.
1:49
Finally, the team exposed the spine. But
1:52
it's not all where it should be.
1:55
>> But this one's been pushed out of
1:57
position so much so that it's up against
1:59
the rib. Should be in the middle of the
2:01
whale. It shouldn't be up against the
2:02
rib. This is crazy. That's a massive
2:04
amount of pressure. And it also means
2:06
that the whale was really snapped in
2:08
half.
2:08
>> You just don't think of whales as things
2:09
that snap.
2:11
>> They shouldn't.
2:12
>> Yeah.
2:12
>> What would normally hit a whale that
2:14
hard? There's nothing bigger than a
2:15
whale in nature and then comes along a
2:17
ship and doesn't know how to handle
2:18
that. I don't think this was done on
2:20
purpose. Yeah,
2:21
>> it's it's more that I'm sad. I'm sad
2:23
that it happens. I'm angry that we
2:25
haven't been able to do something about
2:26
it to stop it. A tragedy more than
2:29
anything else. It's tragedy.
2:35
>> The necropsy complete. The remains of
2:38
the whale are left for scavengers
2:42
and Joy and the team head home.