Pterodactyls or Pterodactyloids................p.g.4
Tyrannosaurus rex was a huge meat-eating dinosaur that lived during the late Cretaceous period, about 85 million to 65 million years ago. Tyrannosaurus lived in open forests with nearby rivers and in coastal forested swamps.
Tyrannosaurus rex was a fierce predator that walked on two powerful legs. This meat-eater had a huge head with large, pointed, replaceable teeth and well-developed jaw muscles. It had tiny arms, each with two fingers. T. Rex had a slim, stiff, pointed tail that provided balance annd allowed quick turns while running. T. rex’s neck was short and muscular. Its body was solidly built but its bones were hollow.
Tyrannosaurus rex was up to 12.4 m long, about 4.6 to 6 m tall. The arms were only about 1 m long. Tyrannosaurus rex was roughly 5 to 7 tons in weight.
TEETH AND JAWS
T. rex’s jaws were up to 1.2 m long and had 50 to 60 thick, conical, bone-crunching teeth that ranged in size from very small to over 23cm long.
Tyrannosaurus had a stiff, pointed tail. Thhe tail was used as a counterbalance for its enormous head, for agility and for making quick turns.
Skin was bumpy, like an alligator’s skin.
Tyrannosaurus rex probably lived in forests, where its prey (plant-eating dinosaurs) could find plenty of food.
PTERODACTYLS or PT
Pterodactyloids lived from the Jurassic period through the late Cretaceous period. Pterodactyls died out during the Cretaceous, about 65 million years ago
The Pterodactyls (or Pterodactyloids) were a group of flying reptiles. They were lightly built with hollow bones, long, curved necks, long skulls, and small bodies. They had large brains and good eyesight. Some had light-weight, bony head-crests, some did not. The crest may have acted as a rudder when flying.
Pterodactyls ranged in size from having a wingspan of a few centimetres (primitive Pterodactyls) to over 12 m (later Pterodactyls). A pterodactyloid about 1.8 m long. Pterodactyls weighed about 50 kg.
Pterodactyloids were carnivores; some had bristle-like teeth, some had no teeth. They ate fish (which they caught at the surface of the oceans), moollusks, crabs, perhaps plankton (for some species), insects, and scavenged dead animals on land.
TAIL AND FUR
Pterodactyls had short tails, some had no tails. Some pterodactyloids had fur on their bodies.
Pterodactyls flew long distances using large, light-weight wings. Pterodactyloid wings were covered by a leathery membrane. This thin but tough membrane stretched between its body, the top of its legs and its elongated fourth fingers, forming the structure of the wing. Claws protruded from the other fingers.
Velociraptor was a fast-running, two-legged di
Velociraptor was about 1.5-2 m.long, and 1m.tall. It may have weighed about 7 to 15 kg. Velociraptor’s head was about 18 cm long. Velociraptor’s brain was relatively large in comparison to its body size.
This meat-eater had about 80 very sharp, curved teeth in a long, flat snout; some of the teeth were over 2.5 cm long.
It had a stiff tail that worked as a counterbalance and let it make very quick turns.
Velociraptor lived in a hot, dry environment – a desert-like environment that had some streams.
Pteranodons were reptiles, but not dinosaurs. They lived during the late Cretaceous period about 85-75 million years ago.
Pteranodons were flying pterosaurs. This wing-span is longer than any known bird. Pteranodons had hollow bones, were lightly built. They had large brains and good eyesight. Some pteranodons had long, light-weight, bony crests on their heads that may have acted as a rudder or stabilizer when flying.
Pteranodons were about 1.8 m long, had a foot 7.8-10 m wingspread, and weighed about 35 pounds; its standing height was about 1.8 m.
They had no teeth. Pteranodons were carnivores. They ate fish (which they caught at the surface of the oceans), mollusks, crabs, insects, an
TAIL AND FUR
Pteranodons had almost no tail, and small bodies; they may have had fur.
Pteranodon wings were covered by a leathery membrane. This thin but tough membrane stretched between its body, the top of its legs and its elongated fourth fingers, forming the structure of the wing. Claws protruded from the other fingers. Pteranodons could flap their wings and fly with power. They flew long distances using large, light-weight wings.