dinosaur part -5

What kinds of dinosaurs could fly?

When most people think of a “flying dinosaur,” they are thinking of a pterodactyl. Although they might look like flying dinosaurs, pterodactyls (and other members of the pterosaur family) are actually not dinosaurs at all! – Technically, pterosaurs are considered flying reptiles, and they are often confused with dinosaurs because they lived at the same time.

One prehistoric animal that is sometimes considered a “flying dinosaur” is the Archaeopteryx. Archaeologists believe that Archaeopteryx had feathers like modern-day birds and a special toe that would have allowed it to hold on to a tree branch. In addition to Archaeopteryx, there are other fossils, such as those of Anchiornis, which are believed to belong to types of dinosaurs that had feathers that may or may not have been used for flight. – Archaeologists don’t know for sure whether or not any of these winged or feathered dinosaurs were able to use these features for flight, but even if not for flying, many guess that they were otherwise used for things like gliding.

As more and more fossils are uncovered, it’s likely that we’ll continue to get new discoveries about cool types of dinosaurs – winged, feathered, flying, and otherwise!

Ferns and conifers characterized much of the dinosaurs' environment.

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Dinosaurs lived during the Mesozoic era, between 248 million and 65 million years ago. During their tenure on the Earth, the continents shifted and the environment changed accordingly. Dinosaurs filled niches that had been abandoned during the mass extinction event of the previous era, so that they inhabited much of the Earth. Although the Earth's environment seems to have been somewhat more consistent during the Mesozoic than it is today, the dinosaurs' habitats were still likely to have been somewhat varied. Despite this, fossil records of both plants and animals allow researchers to make some general statements about their environment.

1. The Continents

   • At the beginning of Mesozoic, all of the Earth's continents we joined into one massive continent called Pangaea. This impacted the distribution of dinosaurs by allowing for massive migration ranges at the beginning of the era. Over time, it split into two continents, the northern continent of Laurasia and the southern Gondwana, with dinosaurs inhabiting portions of each. By the end of the Mesozoic, the continents had split into the forms that we know today. Laurasia split into North America and Eurasia, and Gondwana split into South America, Africa, Australia and Antarctica.

   Climate

   • The climate during much of the dinosaurs' time appears to have been generally warm and dry, except in the tropical middle latitudes. High carbon dioxide levels impacted the ocean by raising water temperature and reducing the oxygen levels. The absence of polar ice caps is also suggestive of a warmer climate during this era. Areas that had been previously covered with glaciers and tundra were now characterized by deciduous forests. Middle latitudes featured tropical conditions, and lower latitudes were arid. Seasonal changes appear to have been less dramatic than they are today, and most plant cycles appear to have been controlled by changes in light rather than changes in temperature.

   Vegetation

   • The vegetation available to the dinosaurs was dominated by seed plants. Ferns were prevalent, especially in the southern regions. The north was characterized by conifers, such as pine trees. The highest latitudes featured deciduous forests dominated by the ginkgo family of trees. Middle latitudes consisted of tropical forests dominated by ferns, and the lowest latitudes were dry savannas and deserts. Flowering plants, including grasses, began to appear toward the end of the Mesozoic.

   Animals

   • Dinosaurs emerged to fill the void left by the massive extinction event that marked the end of the Permian period of the Paleozoic era and the beginning of the Mesozoic. They shared the oceans with new species of fish, swimming reptiles and mollusks such as clams and snails. On land, dinosaurs competed with other reptiles, including turtles, crocodiles and the ancestors of lizards and snakes. Flying reptiles appeared during this era and eventually evolved into birds as scales were replaced with feathers. Insects needed to pollinate the new flowering plant species, such as butterflies, flies and wasps, appeared, as did the first mammals.

Read more: The Type of Environment Dinosaurs Lived in | eHow.co.uk http://www.ehow.co.uk/info_8459840_type-environment-dinosaurs-lived.html#ixzz1Q7UtZ17A

dinosaur part -4

Q. What do dinosaurs have that no other reptiles have? A. Baby Dinosaurs.

Q. Where does a Tyrannosaurus sit when he comes to settle? A. Anywhere he wants to.

Q. What did they call primitive sailing disasters? A. Tyrannosaurus wrecks.

Q. Can you tell 10 dinosaurs names in 10 seconds? A. Yes, 8 Iguanadons and 2 Stegasaurus.

Q. What do you call a dinosaur as soaring as a house, with long sharp teeth, and 12 claws on each foot? A. Sir.

Q. What do you call a dinosaur as soaring as a house, with long sharp teeth, 12 claws on each foot and a own stereo over his ears? A. Anything you like, he won't hear you!

Q. What do you get if you traverse a mouse with a Triceratops? A. Enormous holes in the base boards.

Q. How can you say if there is a dinosaur in bed with you? A. By the `D' on his pajamas.

Q. How do you recognize if there is a Brachiosaurus in bed with you? A. By the dinosnores. Dinosaur Theories Deccan traps: Other scientists think the extensive volcanic activity in India known as the Deccan Traps may have been responsible for, or contributed to, the extinction. However, paleontologists remained skeptical, as their reading of the fossil record suggested that the mass extinctions did not take place over a period as short as a few years, but instead occurred gradually over about ten million years, a time frame more consistent with massive volcanism. There was also a certain general distrust of a group of physicists intruding into their domain of expertise. A very large impact crater has been recently reported in the sea floor off the west coast of India.The researchers suggest that the impact may have been the triggering event for the Deccan Traps. However, this feature has not yet been accepted by the geologic community as an impact crater. Extreme volcanic activity and the additional acid rain may perhaps have altered the Earth's climate sufficient to generate mass extinction. The delayed Cretaceous was a time of high tectonic action and additional volcanic action. The super continent Pangaea was splitting up and the continents were taking on their modern-day forms. Extreme volcanic activity would discharge dust and acidic chemicals (like sulphuric acid) into the atmosphere, which causes global cooling, and possibly, mass extinctions. * Changes in the Earth's orbit that might have caused climactic cooling might have caused the extinction. In this circumstance, the dinosaurs couldn't acclimatize to the cold, but the hairy mammals could. This is steady with the type of weather in the late Cretaceous; toward the ending of the Cretaceous, there was a drop in sea level, causing land exposure on all continents, more seasonality, and greater extremes between equatorial and polar temperatures. *Mammals eating dinosaurs' eggs have been suggested as a cause of the K-T extinction. This doesn't explain why so many other species went extinct, or why there are chemical anomalies in the K-T layer. * Large amounts of methane changing the Earth's atmosphere (causing a greenhouse effect). The methane source would be from deep-sea algae deposits and/or from plant-eating dinosaur’s digestion by-products. *The herbivorous dinosaurs' over-foraging and the carnivorous dinosaurs over-culling of the herbivorous dinosaurs could have triggered mass starvation. * A nearby supernova (an exploding star) could have bathed the Earth in deadly radiation. the places on earth in which man difficult to reac... dinosaur part -4 dinosaur part -3 dinosaurs part-2 dinosaurs part -1