Giraffatitan

Giraffatitan was a colossal sauropod dinosaur that roamed the coastal floodplains of what is now Tanzania during the Late Jurassic, roughly 150 million years ago. With its remarkably long neck held high and its front legs longer than its rear legs, this animal could browse treetops that were utterly unreachable to other herbivores of its time. Its body plan was perfectly adapted for high-browsing, essentially filling the ecological role of a super-sized giraffe.

For nearly a century, Giraffatitan was considered an African species of the North American Brachiosaurus, until detailed studies revealed the two were actually quite different animals. In 2009, paleontologist Michael Taylor formally separated them, establishing Giraffatitan as its own genus. The key differences include a more arched skull, differently proportioned vertebrae, and distinct features of the limb bones — differences significant enough to represent millions of years of separate evolution on different continents.

The discovery of Giraffatitan is one of paleontology's great adventure stories. German expeditions to Tendaguru Hill in German East Africa (now Tanzania) between 1909 and 1913 recovered hundreds of tons of fossil bones, transported by thousands of local workers across 65 kilometers of wilderness to the coast. The mounted skeleton in Berlin's Museum für Naturkunde remains the tallest mounted dinosaur skeleton in the world.

Perhaps most remarkably, Giraffatitan's heart would have needed to generate enormous blood pressure to pump blood up that towering neck to its brain — a cardiovascular challenge that has fascinated scientists studying how such extreme body plans could function.