Bob, Bob, Bobbin’ Along: Dinosaur buoyancy may explain odd tracks

Some of the heftiest four-legged dinosaurs ever to walk the Earth occasionally left sets of footprints that include only the imprints of their front feet. New laboratory and computer studies may explain what those animals were doing with their hind legs.

The sauropod group of dinosaur species consisted of large herbivores, some weighing up to 100 metric tons.