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ZoomDinosaurs.com
DINOSAUR ANATOMY AND BEHAVIOR
General Anatomy Size Teeth Herds, Packs Offense Defense Reproduction, Nests & Eggs Blood Pressure
Skeleton Tails Brains Male or Female? Skin Diet Locomotion Life Span Hot or Cold Blooded?

Dinosaur Skeleton

SKELETAL FEATURES

Anatomically, dinosaurs have skeletal features that distinguish them from other archosaurs (crocodilians and pterosaurs). Dinosaurs have reduced fourth and fifth digits on their hands, their feet have three large toes, they have three or more vertebrae composing the sacrum (fused vertebrae by the hip), and have an open hip socket (a three-bone structure). This hip structure gives dinosaurs a posture that positions their legs under their bodies, unlike other reptiles, which have legs that sprawl out to the sides. For more information on T. rex's bones, click here.

HIPS
Dinosaurs are classified by their hip structure, into the Order Saurischia (meaning lizard-hipped) and the Order Ornithischia (meaning bird-hipped). This division by pelvic (hip) structure is based on their evolutionary tree; early in the Triassic period, dinosaurs branched into these two groups from their ancestor, thecodonts.

SaurischiansOrnithischians


SKULL
T. rex skull The dinosaurs were diapsids (as are all reptiles except turtles), animals that had two extra holes in the sides of their skulls.

Some Dinosaur Skeletons:
Brachiosaurus skeleton

Brachiosaurus Skeleton

Brachiosaurus was a tall, long-necked plant-eater.
Stegosaurus Skeleton

Stegosaurus Skeleton

See the bones of this huge, plated plant-eater.


Triceratops Skeleton

A plant-eating dinosaur with three horns and a frill on its head.


Tyrannosaurus rex Skeleton

The king of the dinosaurs; a huge meat-eater.

ZoomDinosaurs.com
DINOSAUR ANATOMY AND BEHAVIOR
General Anatomy Size Teeth Herds, Packs Offense Defense Reproduction, Nests & Eggs Blood Pressure
Skeleton Tails Brains Male or Female? Skin Diet Locomotion Life Span Hot or Cold Blooded?


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