抹香鲸有多少只

giant whales dive all at once look they go straight down head first these are sperm whales the only whales living in the deep sea amazingly they can dive as deep as three thousand meters they are the deep diving champions of all mammals in the depths lie ten meter giant squid giant whales fight with the squid in the deep sea and that's today's feature character the sperm whale recent studies show that sperm whales spent two thirds of their lives in the deep sea actually their bodies have evolved to catch prey only in the deep it's their destiny to dive deeply in this episode we introduced the new legend of unique whales that live in the deep sea in the middle of this immense sea lies the ogasawata islands 1000 kilometers to the south of tokyo this is where we can encounter sperm whales wow， what a job dolphins welcome us the seas around the islands are warmed the water temperature year round doesn't go below 20 degrees celsius called the galapagos of the east various life forms inhabit these waters ah， there's one a sperm whale sperm whales can be as long as 18 meters they're like submarines this is an eye and this whole part sticking out to the right is its head which takes up a third of its body the most significant part is its mouth it's long and skinny like chopsticks this cute mouth unlike its huge body pinches prey this is dr kyoichi maudi who's observed sperm whales for ten years he can recognize most of the sperm whales living in the ogasawata islands dr modi says sperm whales have strong family ties look they gather around here too this family seems to have ten members or so there's a baby several days old sperm whales bear babies only once every five years all family members help protect and raise their precious babies wales live in matriarchal families the females in the same family and their babies live together adult males live alone， so they aren't here ah a baby goes underneath its mother it's poking her belly ah， it's feeding time are the baby goes up to the surface not being able to hold its breath it goes up to breathe even the deep diving champions can't dive right away at birth hmm it goes to breathe again dr morty and his team have recently discovered an unexpected fact their study found that the whales go back and forth between the surface and the deep more frequently than expected this was found by attaching depth gauges to them they normally descend to the deep in ten minutes stay there for about twenty minutes and ascend in another ten soon after resurfacing they descend again and they repeat this pattern most of each day they write the surface for only a third of their lives and stay in the deep for the other two thirds on top of that the depth they dive to is extraordinary let's compare them with other diving masters first a professional diver goes down she can easily dive thirty meters seeking abalone in seaweed the bearded seal the most popular animal in zoos is also a master of diving it can dive to around 300 meters ten times that of the professional diver yet a sperm oil can go into the deep in no dime， it can easily descend 2000 meters a 3000 meter dive has even been recorded in the mammal class sperm oils can dive deeper than anybody or anything they're amazing diving champions now a family of diving champions begins descending as if on q they go straight down all at once the whales are totally upside down it's quite a strange sight their huge and heavy heads are wonderful weights they close their mouths tightly to reduce the drag of water also they can die for one hour without breathing which humans can never do won't they suffocate in fact sperm oils take an oxygen at the surface and store it in muscle cells throughout their bodies tire bodies become our long oxygen tanks， but what could there possibly be thousands of meters deep to make them go down full of oxygen 18 meter long giant squidge and more large squid lie in the depths after battling with them sperm whales swallow them there's such tremendous creatures wait a minute oh， hey you why do they have to go to the deep sea when there is so much fish and squid in shallow waters exactly， but there's a deep reason for them to die， i have that deed now you sound like me so what's the reason this story began tens of millions of years ago when the ancestors of sperm whales lived near the surface as other whales， but a joint rivals made fierce competition in shallow waters their huge bodies wouldn't let them move quickly that's right not being able to compete at the surface the ancestor sperm whales shifted to the deep seat surprisingly in the dark of the deep sea giant squid were living and as there were no rivals they could have all the squid they could catch to snag giant squid their mouths of into the form of chopsticks to the point where they became unable to hunt small fish in shallow waters ah what does that mean let's look at the mouths of humpback whales which live in shallow waters okay let's see whoa they are huge with these large mouths they catch fish and plankton near the surface all in one scoop wow， i'm so surprised my jaw almost dropped it can't be done with miles like job sticks that's right eating giant squid in the deep sea is the only way for sperm whales to survive gosh they've all been such a drastic way to live the family of sperm oils goes down to the deep sea again it becomes totally dark beyond 200 meters how do they find giant squid sperm oils make this cracking sound？ actually， there's a secret to this sound let's visit a show at an aquarium the shoman are the baloogas， which are related to sperm whales they perform a trick with blindfolds when showing a ballooga， a yellow plastic board amazingly it chooses the yellow board sending sounds from their heads and receiving reflections balooga's grasp the size and material of objects this time it's a metallic board and it chooses the right one it's like they use sound instead of light to see things and soak in sperm whales from their heads they discharge cracking noises as though lighting with searchlights in this way， they look for prey in the deep dark sea teamwork is also important for hunting in the dark each family member discharges sounds to range the chances of catching a giant squid in the limitlessly stretching dark it's believed that they communicate with each other with these sounds for hunting sperm oil families show great teamwork something terrible has happened when the family all dives at once look closely their baby whale is left out on the surface in chapter two danger closes in on the lone baby whale spermwell families who live near the ogasawata islands stay here year round which is quite rare normally sperm whales raise babies while roaming across the wide range of the ocean because if they stay in the same area， they run out of food so how can these families settle in the islands？ the answer is in the submarine topography around the islands on the east side of the ogasawa islands there are domina cliffs plunging to a depth of 8000 meters along their slopes nutrients are constantly brought up from the sea bottom therefore numerous large squid led by the giant squid can grow there this is an unusual image of a two meter long squid which was captured in the islands if there is so much for this kind of squid sperm whales don't have to roam for food right from shallow waters to deep seas the ogasawata islands are a rare bountiful treasure japanese are proud of the family of sperm whales dive all at once seeking prey their baby is left alone at the surface it just can't dive thousands of meters deep yet no matter how hard the baby tries it doesn't work the baby is still too small to dive wait a minute oh you back already yep， because i have to say something isn't it too risky to leave such a small baby alone hmm you're angry because many animals closely kept their babies to protect them such as these tiny monkeys， these huge humpback whales and these elephants that's true， but in the sea of okasa water it's safe enough to leave a baby behind huh what do you mean look at this there's sperm whales off the coast of northeast japan far from the ogasawata islands oh it looks chaotic what's going on killer whales are attacking a family of roaming sperm whales oh， no fierce killer whales are the biggest enemies of sperm whales babies are especially easy targets once they get parted from their families they won't survive oh or babies， but there are no killer whales in the warm seas of the olgassawata islands whoa why not killer whales prefer the cold seas abundant with fish and other bray more killer whales live in the regions in dark red， see the closer to the north pole， the more red exactly in contrast the ogasawana islands are in the blue region in the south around here yes， the number of killer whales is one fiftieth that of the northern seas so there are hardly any hmm now， i see with lots of prey in the deep sea， but no killer whales the warm seas of the ogasawata islands are perfect for raising babies oh raising kids a relaxed tropical zone that's a superbly well lifestyle one hour is fast since the family headed down to the dents the mother whale comes back a little ahead of the rest of the family being alone for so long the baby will is very happy to see her it begs for milk in no time， it's still such a baby soon the rest of the family comes back to the surface huh， one of them carries something white in its mouth that's the meat of a giant squid all family members participated in the hunt to catch this big prey in the deep sea sperm oils carrying prey to the surface have been observed many times in the past in this way， they provide for family members who can't hunt so well on top of that look carefully the baby goes to the meat they also give squidmee to the babies before weaning observing whales for many years dr modi says that souvenirs of large squid are very important for babies from the taste of deep sea prey baby whales learn that their food exists somewhere very deep in the ocean after a while the sperm whale family goes back to the deep the baby stays near the surface again but this time it begins playing wow， it's jumping as soon as it jumps it goes down it's not a great jump yet to be sure suddenly a big shark shows up it closes in on the baby normally， it eats things like sea turtles but when it's hungry it attacks baby whales and it's coming closer the baby's too busy playing to notice the shark closing in watch out right then the family surfaces from the deep sea one of them quickly gets close to the baby all the family members make big sounds to intimidate the shark even a shark can't take this it swims away in haste the entire family cooperates and saves the baby that's teamwork only a tight knit family caring for each other can show baby whales grew up with the loving care of families in chapter 3 the diving training for babies finally begins the mother has an unexpected technique to teach your baby who can't dive well yet sperm whales live two thirds of their lives thousands of meters deep special dive training starts when babies are still small mothers are the coaches swimming with their babies they gradually go deeper a spoiled baby tries hard to follow its mother the mother leads the baby going deeper， but it goes back to the surface it can't hold its breath very long then the mother uses her trump card she begins descending while giving milk to the baby the baby is so preoccupied with the milk that it follows her forgetting about breathing baby whales gradually learn how to dive unconsciously one day the family of sperm whales dives into the deep as usual right then the baby whale starts going straight down following the others it's no longer training the baby descends deeply at once other family members go down with the baby gently surrounding it deeper and deeper heading into the deep the baby keeps descending calmly and disappears before long into the blue world a new legend of sperm oils is found in the seas off the ogasawata islands these families live in depths of up to three thousand meters taking care of each other they are the pioneers of the deep sea where no weather mammals can reach their deep yet silent descent is truly majestic。