Sauropods, the gigantic dinosaurs with long necks and tails, were the undisputed land giants of the Mesozoic era. Their massive size has always puzzled scientists. How did these animals manage to grow so large when their modern-day relatives, like elephants and rhinos, are much smaller?

A new study published in the journal Current Biology offers some answers. The researchers, led by Dr. Paul Upchurch from University College London, found that sauropods had a unique feeding strategy that allowed them to consume vast amounts of plants.

Upchurch and his team studied the fossilized teeth of 17 different sauropod species. They found that these animals had teeth that were specially adapted for grazing on low-lying plants. This would have given them access to a huge source of food that was unavailable to other herbivorous dinosaurs.

In addition to having specialized teeth, sauropods also had very long necks and tails. These long limbs would have allowed them to reach plants that were high up in the trees.

The researchers' findings suggest that sauropods were perfectly adapted to their environment. They could reach plants that other herbivorous dinosaurs couldn't reach, and they had the teeth to process huge amounts of plant material. As a result, these animals were able to grow to truly extraordinary sizes.

"These dinosaurs were probably doing something quite different from other dinosaurs,'' Upchurch said. And as a consequence, "you get these giants."

The study's findings provide new insights into the evolution of these long-necked dinosaurs. They may have even influenced the evolution of mammals, including humans.

Upchurch suggests that sauropods may have indirectly aided human evolution simply by clearing pathways and changing environmental conditions to fit their gigantic needs.

"Their influence,'' he concludes, "was really much greater than what people used to think.''