Move over T rex: the spine lizard was the true king:nearly three storeys high and longer than a b u s , the Spinosaurus was the largest carnivorous d i n o s a u r to walk t h e Earth. The 'spine lizard' roamed the coastal plains and swamps of North Africa i n t h e mid-Cretaceous period. Unlike the Tyrannosaurus rex, Spinosaurus teeth w e r e not serrated, so they were not used for tearing through flesh; its conical teeth, powerful jaws and long snout were better suited to snapping up large fish. It's thought that Spinosaurus was the first dinosaur to swim, and that it spent a lot of time in the water where it could snatch aquatic creatures with its razor-sharp claws. There is evidence to suggest Spinosaurus' snout openings and skull cavities were part of a pressure- detection system, so it could sense the movements of fish even in murky waters. The giant carnivore's defining feature was the 1.5-metre-high 'sail' on its back, formed by tall vertebral spines. This may have been a display to attract mates or intimidate rivals, help regulate temperature, or possibly support a camel-like hump of stored fat that Spinosaurus could build up when food was plentiful.Mega monitor lizard:Also known as Megalania, these giant goannas of eastern Australia were the largest land lizards of all time. They could grow to lengths of over five metres and weigh as much as 600 kilograms. Megalania had razor-sharp teeth and claws, perfect for tearing into its prey. These large lizards compensated for their lack of speed by lying in wait to ambush victims, and sought out carrion using their excellent sense of smell.Super-sized serpent:Reaching lengths of up to 15 metres, Titanoboa was one of the largest land animals on Earth following the extinction of the dinosaurs. These colossal serpents lived in the jungles of South America, devouring turtles and crocodiles in single mouthfuls. Titanoboa could hunt on land and in water, slithering or swimming up to its prey undetected, then suddenly leaping up to clamp its powerful jaws over the victim's windpipe.Terror birds:These terrifying predators of prehistoric South America were members of the Phorushacidae family, known as 'terror birds', and some could reach heights of three metres. Their main weapon was a sharp, hooked beak that could strike victims from above like a pickaxe. The birds' legs were also incredibly strong, and they may have used their feet to kill by repeatedly kicking, or thrown their prey violently to tenderise the meat.根据上述英文内容，生成一片英文讲解的科普视频。

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Throughout Earth's history, massive predators have dominated ecosystems in ways that make T-Rex look small. From the aquatic Spinosaurus of North Africa to the giant monitor lizard Megalania of Australia, from the colossal serpent Titanoboa of South America to the terrifying Terror Birds, these apex predators showcase incredible evolutionary diversity. Each developed unique hunting strategies perfectly adapted to their environments, proving that prehistoric life was far more varied and spectacular than we often imagine. The Spinosaurus was truly the king of prehistoric predators. Standing nearly three storeys high and stretching longer than a modern bus, it dwarfed even the mighty T-Rex. This massive carnivore roamed the coastal plains and swamps of North Africa during the mid-Cretaceous period. Unlike T-Rex's serrated teeth designed for tearing flesh, Spinosaurus had conical teeth perfectly adapted for catching large fish. Its powerful jaws and elongated snout made it an expert aquatic hunter. Scientists believe it was the first dinosaur capable of swimming, spending much of its time in water snatching prey with razor-sharp claws. The most distinctive feature was its enormous 1.5-meter-high dorsal sail, which may have served multiple purposes: attracting mates, intimidating rivals, regulating body temperature, or supporting a camel-like hump for fat storage during abundant times. Meet Megalania, the mega monitor lizard that dominated eastern Australia as the largest land lizard of all time. These incredible predators could grow to lengths exceeding five meters and weigh as much as 600 kilograms. Armed with razor-sharp teeth and claws perfectly designed for tearing into prey, Megalania was a formidable hunter. Unlike fast-moving predators, these giant lizards developed a different strategy - they were masters of the ambush. Megalania would lie in wait, perfectly camouflaged, until unsuspecting prey wandered within striking distance. They also had an excellent sense of smell, allowing them to locate carrion from great distances. This combination of patient hunting and scavenging made them incredibly successful apex predators in prehistoric Australia. After the extinction of the dinosaurs, new apex predators emerged to fill the ecological void. Titanoboa was one of the most spectacular - a colossal serpent reaching lengths of up to 15 meters, making it one of the largest land animals on Earth during the post-dinosaur era. These massive snakes dominated the jungles of South America, where they were perfectly adapted for both terrestrial and aquatic hunting. Titanoboa could devour enormous prey including turtles and crocodiles in single mouthfuls. Their hunting strategy was devastatingly effective - they would slither or swim silently toward their prey, remaining completely undetected until the final moment. Then, with explosive speed, they would leap forward and clamp their powerful jaws over the victim's windpipe, using their immense body weight and constricting power to subdue even the largest prey. The Terror Birds of prehistoric South America were among the most fearsome predators ever to walk the Earth. These terrifying hunters belonged to the Phorusrhacidae family and could reach towering heights of three meters, making them true giants of their time. Their most devastating weapon was a massive, sharp, hooked beak that could strike victims from above with the force and precision of a pickaxe. But their arsenal didn't stop there - Terror Birds possessed incredibly powerful legs that served multiple deadly purposes. They could deliver bone-crushing kicks repeatedly to subdue struggling prey, or use their immense strength to grab victims and throw them violently against the ground to tenderize the meat before consumption. These remarkable predators showcase how avian evolution produced some of the most efficient and terrifying hunters in prehistoric ecosystems.