Some of the most compelling evidence that dinosaurs traveled in large herds has just been uncovered in the Republic of Yemen. Researchers found tons of dinosaur tracks, unearthed by a local journalist, which show the footprints (pictured) of both two-legged and four-legged dinosaurs roving in large groups in the Arabian Peninsula. This was before the Red Sea had formed, so the dinos probably just tromped there from Africa. [First Dinosaur Tracks in the Arabian Peninsula via PLoS One]