???? From the depths of the oceans to skies once dominated by colossal creatures, Earth's history is rich with gigantic animals that defy the imagination. The largest creatures of all time offer a fascinating insight into the evolution of life on our planet, and their study reveals unique and complex ecosystems. Whether it's the giant dinosaurs of the Mesozoic, the modern cetaceans that still rule the seas, or the large insects and reptiles of antiquity, all of these creatures bear witness to Earth's astonishing biological diversity. Among the champions of size is the titanosaur, one of the largest dinosaurs that ever existed. These colossal sauropods, which lived about 100 million years ago, could reach lengths of more than 30 meters and weigh up to 70 tons. The Patagotitan mayorum, discovered in Argentina, is often cited as an emblematic example of these gigantic creatures. With their long necks and imposing tails, these herbivores dominated the landscapes of their time, feeding on the lush vegetation that covered the continents. But they were not the only dinosaurs that impressed with their size: other dinosaurs such as the Spinosaurus, a semi-aquatic predator that could reach between 15 and 18 metres in length, dominated river and swamp regions. Even larger creatures swam freely in prehistoric seas. The Megalodon, a gigantic shark that reigned between 23 and 3.6 million years ago, remains one of the most iconic figures. With an estimated length of 18 metres and teeth as big as a human hand, this predator was the undisputed king of the oceans. Ichthyosaurs, marine reptiles from the Mesozoic era, were also among the mastodons of the seas. The ichthyosaur Shonisaurus sikanniensis measured almost 21 metres in length and illustrates the astonishing diversity of prehistoric marine ecosystems. These colossal predators coexisted with equally remarkable prey, such as giant ammonites, which adorned the seafloor with their spiral structure. In the modern world, the reign of the giants continues in a different form. This incredible animal, 30 metres long and 150 tonnes, is the largest creature known. It embodies the power and splendour of contemporary marine life. Prehistoric lands were also home to insects and arthropods of impressive size. During the Carboniferous period, some 300 million years ago, giant dragonflies such as Meganeura planae had wingspans of almost 70 centimetres. These flying creatures were among the largest insects ever to have existed and evolved in a world where high oxygen levels favoured their gigantism. On land, sea scorpions such as Jaekelopterus rhenaniae reached almost 2.5 metres in length and dominated shallow aquatic environments. The evolution of giant creatures has always faced ecological and physical limits. The immense size of these animals imposes restrictions on their feeding, reproduction and mobility. For example, dinosaurs such as the titanosaur had to consume enormous amounts of vegetation to sustain their colossal mass, while the blue whale relies on the richness of marine ecosystems to maintain its energy reserves. Furthermore, the extinction of numerous giant creatures throughout history, often caused by climatic phenomena or cataclysms, illustrates the long-term challenges faced by these enormous organisms. This channel is an official affiliate of the ORBINEA STUDIO network.