was it cold enough for them to have developed this adaptation, and did it help them survive whatever killed the dinosaurs?
216903
Perhaps... the weather during the early part of the Cretaceous was warmer than today (and more uniform.)  I'm actually in the process of writing a paper exploring the possibility of hadrosaur hibernation in northern Alaska.\n\nI took a tour of a dinosaur resource center today.  The tour guide said that ability to adapt is what saved KT survivors.  Crocodiles can go months without eating.  Birds migrate.  Fish could swim to deeper water.\n\nIt is still highly debated to what caused the Cretaceous Tertiary extinction.
213376
Nothing that was fully aquatic, but penguins, puffin relatives, fulmars, ducks, and many other sea birds would have evolved by then.\n\nIf you are referring to plesiosaurs, ichthyosaurs, etc., they weren't dinosaurs and were long extinct by the time mammoths came around.
118530
It's obvious why he is shy, people want to capture and/or kill him. I would be very elusive too, wouldn't you? I don't know if dinosaurs chewed cavemen bones or tossed them up in the air or not. Some were carnivorous so they probably did snack on them a little.
207935
I think that you are right. Well you are right. Dinosaurs did get killed by a big comet that hit the earth. Also the sun was blocked out so the plants died therefore the plant eaters died. And if the plant eaters died then the meat eaters would starve and then they would die. And that is how the dinosaurs died. \nFrom KitKat
210356
NONE.  All things were created!  Things adapt to changing environments, but they never turn into something entirely new.
241134
Yes, it's going pretty fast! When you think that 150 years ago there were no cars or airplanes. Pretty freaky.\nNothing moved this fast in the past 1,500 years.\nAlso, going off on a tangent a bit... Did you know that 90% of all the extinct creatures that we know about (including all the dinosaurs) have become extinct in the past 150 years!\nMaybe it's all going too fast.
51154
no because cold blooded animals are dependant of the  environment temperature \nif the temperature outside drops to 0 C you would die
127043
Birds are the direct descendents of dinosaurs.  Many scientists will say they *are* dinosaurs.  As such, they are alive, so dinosaurs are alive.\n\nWhile it remains possible that some dinosaurs proper have survived, it is extremely unlikely at this point.  There is no physical evidence for it.\n\nYour second question is difficult to answer.  Are there prehistoric creatures that have survived?  Sure!  Pretty much every species on earth today (even humans!) is older than history, that makes it prehistoric!  Defining prehistoric any other way would essentially make prehistoric mean "not surviving today", so the answer would be no.\n\nWhat you mean, of course, is creatures to have survived from truly ancient times, such as from the Mesozoic (age of dinosaurs) or older, but again, it's difficult to answer.  There probably aren't any actual species that old, but it's difficult to tell if something in the fossil record is actually the same species as something alive today.  Consider, lions and tigers look and act very different alive and are certainly two different species, but it is very difficult to tell their skeletons apart.\n\nA lot of so-called "living fossils" really aren't.  For instance, we have no fossils of the Coelacanth.  It's closest relatives in the fossil record are in another family (as different as cats and dogs).  Cockroaches are often said to have been unchanged for millions of years, but it's not the case as the fossil record records them evolving continuously.  The first fossil cockroaches had three pairs of wings!\n\nBut some things have survived nearly unchanged for millions of years.  Six-gill and Port Jackson sharks are very much like they were in the age of dinosaurs.  The Tuatara is surprisingly like it's Mesozoic relatives.\n\nBut the king of living fossils is the Lingula brachiopod.  It looks like a clam and lives by filter feeding, but don't let it's calm appearance fool you.  These little guys are survivors.  They've been living in Earth's oceans almost unchanged for 550 million years!  That's almost as long as we have animal fossils at all!  Dinosaurs are hardly teenagers by comparison!\n\nAddenda:  The Komodo Dragon is NOT believed to be a dinosaur, at least not by scientists.  It is just a large monitor lizard.  Dinosaurs are not lizards, being classed among the Archosaurs with the crocodiles, pterosaurs and birds.
253419
I think that the grey 'aliens' are in fact from Earth. My theory is kinda kooky, but Ive been reading into ufos, alien abductions, and stuff for many years. \nIntelligent, bipedal, small dinosaurs got trapped inside of deep caves millions and millions of years ago. They survived, thrived, and adapted to the environment of the deep. They eventually developed a form of science and discovered genetic engineering. They built the flying saucers, created the grey 'aliens' and bigfoots and may have even created us. Some of them are able to take human form and have always been a part of our societies and politics and religeons since our earliest days. They continue to require our genetic matireal however. They are really worried about nuclear weapons because they are affected by underground nuclear blasts and fall-out will hurt them too.
370508
I believe it is about 6,000 years old, based on a plain sense reading of the Scriptures alone.  The Bible also explains dinosaurs very well. Dinosaurs are land animals. Land animals were created on Day 6, thus dinosaurs were created on the same day as Man, and Man walked with dinosaurs originally. The dinosaurs, like all the others, were vegetarian in their diet. There was no death before the fall, and all ate plants and fruits. The sin of Adam changed many things, and perhaps carnivory began after the fall. Two of each kind of dinosaur went up the Ark (the rest died in the flood waters), they left the Ark, and many went extinct like any other animal that has gone extinct. We have stories and legends of men dueling and killing monsters or dragons which are most likely based on the encounters with surviving dinosaurs. You won’t find the word “dinosaur” in our Bibles because it was a word invented in 1842, after the Bible was translated into English. Instead we have words like Behemoth and Leviathan which are descrined in detail in Job. And when dinosaur bones are being dug up, there are no tell tale labels about how old they are. In fact, scientists have found red blood cells and muscle tissue when they cut opened the T-Rex fossils. The implication of this finding is that the fossils aren’t millions of years old.
171819
Very few mammals actually hibernate.  Only a few small rodents that live in the far north (such as some ground squirrels) undergo a seasonal estivation during the winter.\n\nEven most arctic mammals remain active all year long.  Polar bear, caribou, arctic fox, bison, meadow voles, lynx, snowshoe hares, etc. etc. all live quite well through the winter.\n\nSome bears (black bears, brown bears) enter a state of torpor through the winter, but even they do not truly hibernate.\n\nAnother reason humans don't hibernate is that we didn't evolve in a cold climate where hibernation would be advantageous. \n\nHomo sapiens sapiens evolved in sub-Saharan Africa, and there are few cold winters there (even during Ice Ages).  The only way we can survive in northern climates is through our learned adaptations of technology:  fire, and clothing.\n\nLynx and wolves live and hunt all winter long without any clothes, and large herbivores like bison and caribou don't even have shelter.  How long do you think humans would last in Canada if they were naked and couldn't build a fire?\n\nOur niche is the savannahs of Africa.  People can (and do) survive quite nicely there without much in the way of clothing.  It's one of the reasons we prefer a room temperature around 22 C.  It could also be why we like having an expanse of short cropped grass dotted with one or two trees in front of our caves.\n\nWe evolved to fit into that particular ecological niche, and were able to adapt other niches to meet our needs with our technology.
171119
no-we humans would then build large floating continents to live on- and yes ive seen water world- but i dont think thats possible- it would take millions of years for such an evolution to occur and in the movie the other humans are still the same- for this to happen the costner characters early ancestors should ahev spent their whole lifetime in water(while they still dint have gills)- and i dont see how they could have survived like that.
8268
Why did all of the remaining dinosaurs die out suddenly at the end of the Cretaceous period? There is a short answer and a long answer to this question.\n \n2     Here is the short answer. No one knows for sure.\n \n3     Here is the long answer. There are a number of theories. Some are scientific, and some are ridiculous. Most scientists believe in one or two main ones, but no one knows for sure.\n \n4     The reason no one knows for sure is because the whole thing happened about 65 million years ago. No one was around to see or hear what was going on back then, and no one was around to keep records.\n \n5     What we do know comes mainly from fossil records. Scientists study the fossils themselves, and they study the rock in which the fossils are found. Fossil records haven't given us definite proof for any one theory. This is because there are some problems with fossil records. For one thing, most fossil evidence of dinosaurs has been found in North America. We don't know as much about dinosaur activity on other parts of the earth. Another problem is that it is very hard to date fossils. Dating fossils means determining how old they are.\n \n6     One really interesting thing about the big dinosaur question is that scientists from many different fields are working to solve the problem. Astronomers, physicists, geologists, paleontologists, ecologists, chemists, geologists and others are all gathering evidence, experimenting, and researching to try to solve the puzzle.\n \n7     The most popular theory is called the Alvarez Hypothesis. This hypothesis says that, 65 million years ago, a big asteroid hit the earth. This asteroid crash scattered dust high up into the atmosphere. It blocked much of the sunlight and caused the earth to become cooler. The crash also started huge fires, high winds, and violent storms that killed some of the dinosaurs. The lack of sunlight and warmth caused many plants to die. This shortage of plants for food caused the rest of the dinosaurs to die out.\n \n8     The second most popular theory says that activity on the earth itself caused the extinction. As the supercontinent of Pangaea was breaking up, movement of the earth's giant land plates caused volcanoes to erupt and the climate to change. These changes affected the earth's atmosphere and temperature, and the dinosaurs died out from the cold or from lack of plants to eat.\n \n9     Other theories suggest that dinosaurs became so big that they couldn't move, or that there were too many dinosaurs and they ate up all of the food.
79202
it hasnt been proven, but there are pictures out there, tho most of them are fake\n\ni personally believe that there probably once was one, but there really isnt much chance that it is still alive\n\nit was probably a decendent of some dinosaur thing\n\nso yea, id say it is, well, WAS real
473912
Assuming it's true, then it's probably because of creatures' abilities to adapt to their environments.  Over centuries, evolution and genetic mutations and such allow different species to form, to become most suitable for their habitat.\n\nHowever, I'm a bit doubtful that a snake, a cold-blooded animal, would be able to survive in such a cold region....
398093
Yes, that's definitely why dinosaurs were so big -- another moon pulling on them! Why haven't all these smart scientists thought of such an obvious answer? And I'll bet that second moon crashed into the earth and killed all the dinosaurs too.
284865
UPDATED!!!\n\nIt is taken seriously, and is now generally accepted as the primary cause of the dinosaurs' demise.  there may have been additional factors, but a meteorite impact is considered to be the biggest one.\n\nFor a long time, however, it was believed that meteroites only struck the earth in the past, and after that initial bombardment, the danger passed.  And most scientists demanded a "smoking gun."  A crater.  That crater was finally found...under water.  Off of the Yucatan Penninsula.  When the meteorite first made contact with the surface of the earth, the top point of the giant rock was six miles in the sky!!  It left a crater 25 miles deep.  Imagine standing on the eastern edge of the Grand Canyon.  If that was the Yucatan Crater, the other side of it would have engulfed the casinos in Las Vegas, Nevada!\n\nThe confirmation that it was an asteroid (or meteorite) strike that killed the dinosaurs was the detection of an element called iridium, which is common in space, but rare on earth.  Another indicator is the presence of shocked quartz close to the area of impact.  There are no normal geological processes powerful enough to shock quartz, but a meteorite, if it was big enough, could do it.  Then as the meteorite and the rock with which it impacts is vaporized and blown up into the earths atmosphere, the huge cloud of dust spreads out over the world and eventually settles back down\n\nScientists can tell when the impact occured because after a certain level of geological stratus (layers of sediment laid down over time), dinosaurs are no longer found.  At all.  When they analysed the materials in this layer of sedentary rock, they found unusually high levels of iridium.\n\nSuch impacts are not necessarily periodic events.  Such a thing absolutely will happen to the earth again.  Not if.  When.  And nobody knows when it will happen.  Astronomers have identified thousands of Near Earth Objects.  Any one of these could be the next to strike us, or perhaps one that we missed.\n\nBut it WILL happen.\n\n"if the planet would have been in the outer reaches how can it really be so impactful that it jolted numerous rocks towards earth"\n\nBecause that far out in space, very small changes in direction can have major impacts on the objects trajectory after it has traveled millions or billions of miles.  If you aim a rifle at the bullsey of a target that is 100 meters away and move the barrel end of the rifle just one centimeter, the bullet may miss the target completely.  Just that small distance can be a big miss at a long range.  Likewise, if an asteroid is on a trajectory that doesn't put earth in any danger makes only a slight change, possibly no more than the width of a human hair, it may wind up on a path that will cause it to crash into earth, or a different planet.  This change in the asteroid's path may be caused by the gravitational pull of a nearby planet, or by one asteroid gently bumping into another.  And this can happen anywhere.  While the asteroid is in orbit within our solar system, or in what is known as the "Asteroid Belt."\n\n"also if the planet is undiscovered how can they say anything about its involvement with earth being peiodic"\n\nGood question.  For a long time, scientists suspected that there was another planet beyond Pluto.  The reasons for this were that although this other planet could not be seen, its gravitational effects on other objects could be detected.  I don't know what the specifics of this process\nwere, but perhaps they measured a slight "wobble" in the orbit of pluto that had to have been caused by something with enough mass to cause the wobble.  Astronomers referred to this object as Planet X.  This planet has now been discovered and verified.  It was named Xena.\n\nIt should also be noted that the cause of a change in an asteroid's path doesn't have to be cused by a planet that is very far away.  There are