The Mysterious First Dinosaurs Could Be Buried Beneath the Amazon Rainforest, According to Scientists

Title: Dinosaurs’ Birthplace: Tropical Gondwana, Not Freezing Poles

In a captivating twist to the dinosaur origin tale, a groundbreaking study suggests that these iconic creatures didn’t emerge from the frosty lands but rather from the steamy regions of ancient Gondwana. Picture hot, equatorial territories spanning today’s Amazon, Congo Basin, and the Sahara Desert—this could be the cradle of life for the world’s first dinosaurs.

The earliest dinosaurs, such as the tiny chicken-sized ones, appeared around 230 million years ago in southern lands like Brazil and Argentina. However, their humble beginnings might have started much earlier and farther north, hidden until now in the inaccessible or under-researched regions of equatorial Africa and South America.

Lead researcher Joel Heath, a dinosaur enthusiast from University College London, explains that these first dinosaurs likely evolved in a hot, arid environment eerily reminiscent of our modern deserts and savannas. "So far, we haven’t found any dinosaur fossils in these regions, but that’s probably because we haven’t looked in the right places yet," Heath notes.

Initially, these pioneering reptiles were outnumbered by colossal counterparts like the 10-meter-long pseudosuchians and pterosaurs riding the air currents on wingspan equal to a fighter jet. But after a series of cataclysmic volcanic eruptions wiped out much of their competition 201 million years ago, dinosaurs seized their opportunity and began their formidable march across the globe.

In their quest for new habitats, these Heat-adapted dinos first fanned out across southern Gondwana and later spread to the adjacent northern supercontinent, Laurasia. The middle-latitude origins proposed by the study are bolstered by the fact that they lie right between the southern fossil finds and the northern discovery sites of their close relatives.

One key finding hints at an intriguing evolutionary connection. Traditional dinosaur cousins called silesaurids, not typically considered dinos themselves, might actually be the missing link to the mysterious early history of the ornithischian dinosaurs. These plant-munching champions later evolved into mesmerizing heavyweights like Stegosaurus and Triceratops.

As for climate’s role in dinosaur evolution, the study proposes that early dinos were ingenious heat-seekers, with sauropods like Brontosaurus and Diplodocus maintaining a preference for balmy climes. Their theropod and ornithischian kin, however, morphed into versatile heat generators millions of years later in the Jurassic period, learning to thrive in colder regions.

While tantalizing fossils await discovery in Africa and South America, one thing is clear: the dinosaur story we’ve been telling ourselves—of downy-coated creatures huddled against the polar chill—might just be another fascinating chapter still waiting to be written.