Illustration of the new sauropod Brontomerus whose description was released iin February. Brontomerus means "thunder thighs" in Greek, referring to its massive ilium which would have supported the largest leg muscles of any sauropod. Its describers theorize that it may have used these powerful legs to kick at predators to defend itself. This picture is loosely based on the official reconstruction by Francisco Gascó, which is based on the data provided in the paper.
See the National Geographic article here, And the Wikipedia article here.