Diplodocids, the group of long-necked, four-legged, plant-eating dinosaurs that includes the apatosaurus (not a brontosaurus), have never been found in South America until a new species was discovered in Argentina last week. Leinkupal laticauda, whose name means "vanishing family" (heartbreaking!) and "broad tail" (uh, ok), has projections on the bones of its spine that set it apart from any other known species of dinosaur. But new species, never before found in South America, whatever, who cares—one of the most interesting things about this find is that diplodocids were all believed to have died out in the Jurassic Period (you know the one), but this fossil is dated from the Cretaceous, making it the most recent diplodocid ever found.
Studying dinosaur bones and physiology can only teach us so much about how dinosaurs actually walked the Earth. Because dinosaurs called theropods are related to modern birds, a few researchers thought they could study how they walk using chickens.
Theropods include dinosaurs like the Tyrannosaurus and Velociraptor, but they also ranged in size all the way down to tiny chicken-sized raptors covered in feathers. Theropods and modern birds also both have spongy air-filled bones, wishbones, and feathers and lay eggs and watch over them.