Dinosaur Extremes
Among the dinosaurs with the most teeth is maiasaurus
Maiasaura was a duck-billed dinosaur with a flat skull and small crests in front of the eyes. This plant-eater had a toothless beak, cheek pouches, and many self-sharpening cheek teeth; hard enamel was found on both the outer surface of the upper teeth and the inner surface of the lower teeth.
Among the longest necks...
the Diplodocus!
Diplodocus held its neck more-or-less parallel to the ground. The long neck may have been used to poke into
forests to get foliage that was otherwise unavailable to the huge,
lumbering varieties of sauropods. 
Thickest Skulled Dinosaur
Pachycephalosaurus was a dome-headed
dinosaur. Its huge head housed an incredibly thick skull, a tiny brain,
and large eyes. Its rounded skull was up to 10 inches thick!
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