{1149}{1297}For 40 million years the plains of|South America have been ruled by {1277}{1361}an awesome group of predators {1434}{1521}The aptly named terror birds. {1797}{1884}But recently all this has changed. {1933}{2064}A new breed of killer has arrived|one fierce enough to terrorise the {2048}{2100}terror birds. {2385}{2492}Smilodon, the f abled sabre tooth. {2561}{2669}The most powerful big cat of all time. {2996}{3100}There is no such thing as|a sabre tooth tiger. {3088}{3189}The correct name for these beasts is|sabre tooth cats and there have {3177}{3235}been many different species. {3229}{3365}The largest, at over 300kgs,|is this one, Smilodon, {3348}{3395}which means ''knife tooth''. {3391}{3476}Originally from North America|they came to South America two {3466}{3508}million years ago. {3505}{3589}The balance of life here changed as|they took over the role {3581}{3629}of top predators. {3635}{3752}They live in tightly knit clans and|this is the story of three dramatic {3737}{3859}months in the life of one particular|group led by a seven year old male {3843}{3900}called Half Tooth. {3929}{4002}Right from the beginning|Half Tooth has problems. {3994}{4078}Recently a pair of|rival males have appeared. {4179}{4257}And they want Half Tooth's crown. {4565}{4658}Half Tooth's territory spans several|hundred square kilometres of {4647}{4761}grassland on one of the strangest|continents on earth. {4751}{4830}Since splitting from Antarctica|30 million years ago, {4820}{4918}South America has been isolated from|the rest of the world and, {4905}{4986}as a result, its animals are unique. {4984}{5056}Oddities thrive here,|like Deodicurus, {5049}{5176}a spiky-tailed relative of|the armadillo the size of a car. {5196}{5277}Even the large herds of|herbivores are exotic. {5267}{5374}These Macrauchenia are unrelated|to any modern mammal. {5390}{5466}And then of course there are|the native predators, {5457}{5531}the flightless terror birds. {5536}{5653}These are three metres tall and|called Phorusrhacos. {5659}{5759}But the isolation of these animals|came to an end when the movement {5747}{5868}of the South American continent caused|it to collide with North America. {5870}{5978}Across a land bridge came new groups|of mammals to colonise {5965}{6011}this exotic world. {6008}{6096}Life here would never be the same again. {6161}{6222}Cats were among those colonists. {6217}{6344}No cat had ever set foot in South|America before but now sabre {6327}{6405}tooths ruled the grasslands. {6433}{6522}Half Tooth took over this clan|three years ago, {6512}{6584}breaking one sabre in the process. {6583}{6660}The group is now made up of|four adult females and {6651}{6705}their offspring. {6718}{6799}All the youngsters are Half Tooth's. {6870}{7014}During his reign, Half Tooth has seen|of many challenges from rival males. {7052}{7139}But none as serious as this one. {7132}{7245}Two rival males have wandered deep|into Half Tooth's territory. {7235}{7320}As usual he is quick to respond. {7349}{7461}But these are brothers and|they are working together. {7509}{7608}Even by Smilodon standards|Half Tooth is a very large {7595}{7726}male but he has never before f aced|two opponents at once. {7709}{7793}The odds this time are|stacked against him. {7988}{8076}The females read the signals and|start to retreat. {8066}{8169}Their only concern is to|protect their offspring. {8273}{8370}These fights can be brutal and|Half Tooth has the most to {8359}{8496}lose - not only control of the clan|but possibly his life. {9058}{9182}No match for the brothers,|Half Tooth is quick to back down. {9230}{9339}He has at least escaped serious injury|but his problems are just {9324}{9483}beginning. Life for a lone male is|a grim battle for survival. {9664}{9780}Half Tooth hasn't had to feed himself|for three years because it was {9765}{9850}the females in the clan|that did the hunting. {9840}{9956}Outcast from the rich grasslands|now controlled by the brothers {9941}{10052}he heads into the scrub forest|on the edges of his old territory {10038}{10114}where he must learn|to scrape out a living. {10146}{10248}With many of the creatures here|he stands no chance. {10243}{10329}Doedicurus, for instance,|are not only well armoured, {10319}{10367}they are huge. {10367}{10447}These are ancient relatives of|the armadillo yet they weigh {10438}{10518}almost 300 times as much. {10648}{10765}Their spiked tail clubs alone|can weigh 40 kilos, as much as {10751}{10797}a cannonball. {10800}{10887}Although fearsome defensive weapons|the males mostly use their {10877}{10923}tails on each other, {10920}{11023}to batter rivals into submission|during hormone fuelled {11010}{11060}jousts for a mate. {11086}{11196}The loser ends up with more than|just his pride dented. {11385}{11561}ln the clan, tensions are running high.|The females will not accept the {11536}{11619}brothers while they still have young. {11767}{11873}Defeating Half Tooth was only|part of the battle. {11978}{12080}lf the brothers are to gain authority|over the clan they'll have to {12068}{12117}kill the cubs. {12267}{12354}Meanwhile, Half Tooth has pushed deeper|into the scrub forest {12344}{12394}in search of food. {12390}{12481}lf anything his task is g|etting more difficult. {12479}{12633}The dense undergrowth harbours|another colossus, a sloth. {12611}{12681}But this is no ordinary sloth. {12716}{12839}This is Megatherium,|a giant ground sloth. {12851}{12998}lt has huge claws, is six metres from|nose to tail and weighs more than {12978}{13021}an elephant. {13018}{13095}A very different beast from|its distant relatives, {13087}{13148}the gentle tree sloths. {13184}{13240}Half Tooth moves cautiously. {13289}{13382}The sloth also boasts|impressive defences. {13415}{13520}Small bones beneath his skin|act like chain mail. {13506}{13601}Adults are virtually indestructible. {13635}{13737}Half Tooth wisely gives|them a wide berth. {14009}{14123}Weeks pass and the wet season|is in full swing. {14189}{14281}The females have done their best|but only two of Half Tooth's {14270}{14390}cubs survive and the brothers|are a constant danger. {14459}{14563}They spend much of their time|patrolling their new territory, {14551}{14683}spraying the boundaries with scent|as a warning to other males. {14857}{14946}They will not attack the cubs while|the mother is present but {14935}{15011}she must abandon them to go hunting. {15008}{15112}This is when they are most at risk|and so this mother protects them {15099}{15175}by hiding them in the dense undergrowth. {15310}{15413}While the females are absent,|the brothers are spotted dangerously {15401}{15472}close to the hiding place. {15541}{15632}The cubs' lives hang by a thread. {15647}{15747}Now their only hope is|to remain motionless. {16281}{16393}Out on the plains there are large|herds of Macrauchenia. {16378}{16514}Unique to South America, this species is|the last of their kind. {16532}{16627}They are prime targets for Smilodon. {16948}{17106}Macrauchenia are f ast, wary animals|and getting close enough to kill {17083}{17143}one takes endless patience. {17164}{17297}The females hunt together as a pack|inching forward to set the trap. {17289}{17379}They have been closing in on this herd|for two hours now. {17380}{17477}Gradually they f an out with the lead|female moving wide, {17466}{17541}trying to encircle their pray. {17563}{17689}Smilodon are powerful killers and|able to accelerate explosively {17672}{17746}but they are not built for long chases {17745}{17842}Unless they get close,|they don't stand a chance. {18323}{18455}One f alse move and they will|have to start all over again. {18921}{19028}The lead female drives the herd|towards the other females. {19922}{20028}Having chosen their target,|the cats close in. {20322}{20412}Macrauchenia have outstanding|manoeuvrability. {20405}{20520}The victim jinks,|completely wrong-footing her pursuer. {20547}{20632}But that's why Smilodon hunt in groups. {20621}{20689}A second cat brings her down. {21087}{21189}Surprisingly, as the cats fight to|restrain their prey, {21177}{21305}they do not use their inf amous teeth|in case they break them. {21388}{21492}First they work together to pin down|the struggling animal under {21480}{21535}the weight of their bodies. {21646}{21795}Only when the prey is totally subdued|are the f amous sabres drawn. {21897}{22000}They are extraordinarily precise and|accurate tools for killing. {21988}{22077}Their teeth simultaneously sever|the blood supply and strangle {22068}{22111}the windpipe. {22108}{22174}One bite and the prey is dead. {22173}{22246}But these are the original|double-edged swords. {22238}{22382}The lethal 20cm sabres are|actually quite fragile. {22370}{22465}They cannot bite into bone and|so Smilodon can only eat {22454}{22516}the fleshier parts of a carcass. {22510}{22554}This is very wasteful. {22551}{22678}Something that hasn't gone unnoticed by|other carnivores on the grasslands. {22882}{22970}The terror birds are|supreme opportunists. {22961}{23041}They may have been replaced as|top predators but they have {23032}{23149}quickly found new ways of surviving,|thanks to the cats. {23509}{23601}Eventually the Smilodon have eaten|as much as their sabres {23590}{23622}will allow them. {23621}{23713}They live the kill for|the birds to pick over. {23755}{23861}South America is not the only place|terror birds are doing well. {23847}{23929}Once the land bridge opened to|North America they were {23921}{24008}one of the few creatures|to spread north successfully. {23998}{24082}While these terror birds eat Smilodon's|leftovers, {24073}{24171}their cousins are running riot|in Texas and Florida. {24256}{24368}They only died out just before|modern humans appeared. {24510}{24614}After the hunt, the mother returns|to where she hid the cubs {24601}{...
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