noun. 1  a. Political division of an area into partially autonomous regions. 2  Loyalty to the interests of a particular region. 3  A feature, such as an expression, a pronunciation, or a custom, that is characteristic of a geographic area.  The use of regional characteristics, as of locale, custom, or speech, in literature or art.
The number of teeth dinosaurs had varied dramatically, depending on the type of dinosaur. Some dinosaurs, like Ornithomimus and Gallimimus, did not have teeth. On the other end of the spectrum, Tyrannosaurus rex had 50 to 60 solid cone-shaped teeth as big as bananas. Hadrosaurs, or duck-billed dinosaurs, had the most teeth: up to 960 cheek teeth! Dinosaur teeth were replaceable. If a dinosaur broke or lost a tooth, another grew in to take the place, behaving much like sharks teeth do today.
In the desert sands of Morocco, scientists found fossils of a colossal Mesozoic killing machine that patrolled ancient river systems and devoured huge prey. Most Popular. The sail-backed predator Spinosaurus is not only the biggest meat-eating dinosaur known, larger than T. rex. According to new research, it may also be the earliest known dinosaur to swim. A new study in Science says that Spinosaurus probably hunted in rivers with its sail rising from the water like the dorsal fin of the great white shark.