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**Tyrannosaurus Rex**: Late Cretaceous apex predator measuring 40 feet long. Bone-crushing jaws exerted 8,000-pound force, hunting hadrosaurs and ceratopsians. Tiny two-fingered arms contrasted massive hind limbs built for sprinting.
**Triceratops**: Heavy herbivore w...ith three facial horns and a bony frill shielding its neck. Weighed 12 tons—adults sparred by locking horns while juveniles stayed near protective herd formations.
**Velociraptor**: Turkey-sized pack hunter from Mongolia’s deserts. Retractable sickle claws disemboweled prey; quill knuckles suggest evolutionary ties to modern birds.
**Brachiosaurus**: Jurassic gentle giant stretching 85 feet tall. Pillar-like legs supported 62-ton bulk as it stripped treetops with chisel-shaped teeth. Nostrils atop its head likely amplified resonant calls.
**Stegosaurus**: Plated herbivore with a thagomizer tail spike defense. Vascular dorsal plates regulated body temperature; walnut-sized brain limited complex behavior despite 20-foot frame.
**Ankylosaurus**: Cretaceous tank armored with osteoderms and a club-like tail. Low-slung body repelled T. rex attacks; beak-shaped mouth cropped ferns while nasal chambers filtered dusty air.
**Pteranodon**: Winged reptile with a 23-foot wingspan gliding above ancient seas. Toothless beak scooped fish mid-flight; crest stabilized head during dives. Not a true dinosaur—classified as pterosaur.
**Spinosaurus**: Semiaquatic carnivore longer than T. rex. Crocodile-like jaws snatched fish; dorsal sail stored fat or dissipated heat. Webbed feet and dense bones aided river navigation.
**Parasaurolophus**: Crested hadrosaur emitting low-frequency calls through hollow head tubes. Herds migrated between floodplains and forests, chewing tough vegetation with dental batteries.
**Allosaurus**: Jurassic apex predator with serrated teeth for slicing sauropod flesh. Pack hunting tactics overwhelmed larger prey; hinged jaws opened wide to inflict deep wounds.
**Diplodocus**: Whip-tailed sauropod stretching 108 feet. Neck vertebrae minimized weight while horizontal posture allowed sweeping vegetation fields clean. Swallowed stones to grind plant matter.
**Pachycephalosaurus**: Bipedal dome-head ramming rivals at 15 mph. Thickened skulls with shock-absorbing tissue prevented fractures during mating-season dominance contests.
**Compsognathus**: Chicken-sized scavenger hunting insects and small reptiles. Hollow bones and elongated legs enabled bursts of speed; fossils found with lizard remains in its stomach.
**Iguanodon**: Early Cretaceous herbivore with thumb spikes for defense. Walked quadrupedally but reared on hind legs to reach foliage; cheek pouches stored food before chewing.
**Carnotaurus**: Horned predator built for explosive sprints. Vestigial arms lacked functional wrists; flexible jaw unhinged to swallow prey whole. Skin impressions reveal mosaic scales.
