Dinosaur practice.

Fun fact: What we think dinosaurs look like is all just made up. Its not real, very very few dinosaurs actually have left enough of their imprint on things like slate to get any sort of accurate picture of them. Yes science has gone along way to determine where muscles attached to the bone and the placement of the bones and such and computers can generate a possible outcome and studying birds helps greatly. But most of it comes down to artistic freedom because with out the real living thing we can only guess so much.