Lambeosaurus, a crested hadrosaur from the Late Cretaceous.

Like others of its kind, it uses its unique hatchet-shaped crest as a sort of resonating chamber. Though not essential, it’s also great at giving a thumbs up!

In my opinion, the most interesting thing about hadrosaurs isn't the presence or absence of a crest, but the way they move. They are able to walk as bipeds or quadrupeds as the situation demands, a rare feature in the animal kingdom.

Hadrosaurs are commonly called "duck-billed dinosaurs" after the toothless beak at the front of their mouths, but they aren't completely toothless! Behind the beak are dense concentrations of teeth that are continually replaced, sort of like a shark. If sharks were cows, that is.