Comments (Page 1,129)

Spinosaurus' arms have never been found, but if they were I imagine they would be just as proportionately long as any spinosaur's, nearly as long as their legs. It's either 1. Spinosaurs walked quadrupedally quite often 2. The weight limit for bipeds is higher than we thought 3. Spinosaurus was far lighter than any other spinosaur or even dinosaur period in build 4. Spino was smaller than we thought and just had a big skull 5. Spino spent almost all of its adult life in water. 1. Is possible but considered unlikely, 2. is probable, 3. Is very highly unlikely, 4. is usually only considered true by extreme Spino haters, 5. has been proven false by isotopic ratio analysis. Have you noticed that the bigger spinosaurs are, the bigger their sails/ridges? Irritator had a tiny ridge on its back, Baryonyx had a moderate ridge, Suchomimus had a tall ridge, Horror Mouth is rumored to have a pretty tall ridge, Spinosaurus has the tallest. Maybe it had something to do with helping hold their weight in a position that relieved stress on bones and joints?

I agree,10 tons is about as much as you get for a theropod.

The theory that Spinosaurus walked on all fours is nothing new. The reason it's not talked about much is because most scientists find it unlikely. As far as Spinosaurus living in water it's whole life, unlikely. It had the most land based life of any spinosaur. You can only get so big and still walk on two legs. All the other big theropods max out at 7-10 tons. What that tells me, is that the heaviest an animal can be and still walk on two legs is 7-10 tons. That's one reason why I think Spinosaurus weighed no more than 7 or so tons.

Spinosaurus has arms that are, what, 6, 7 feet long? I forgot. Anyways, it really couldn't walk on all fours. Its fron legs aren't long enough. Now just because the hadrosaurs have front legs doesn't mean that all dinosaurs with very long arms can. It is 20 feet tall at the hips, so its arms might stretch halfway down, but its hips and overall body isn't made like a hadrosaur with very tall hips and a torso closer to to ground. As for the sauropods running, I doubt it. The Prosauropods probably walked on thier back legs a lot, but they where really no runners, and they where lighter. I wouldn't be too suprised to see a Diploticus walk a few feet on its back legs, and by feet I mean steps. Remember, with sauropods, they would have to support thier torso, but thier tail is on the ground, which takes out a fair amount of weight.

That's an interesting point DinoFights. Walking on all fours would limit Spino though. I guess for short periods of time (if it was really heavy, 12 + tons), it could walk on just it's rear legs. It probably did stay in water a lot though.

There probably is a limit to having weight on two legs, but we don't know what it is. Spino could have dealt with the issue by A.) staying in water a lot of the time B.) Walking on all fours (they did have very long arms) C.) Ignoring cope's rule the same way bumble bees do. They're too heavy to fly with such tiny wings, yet they do. Spino could have walked on two legs because cope's rule was made when T. rex was considered the biggest thing ever to walk on two legs. Recently, footprints have indicated that sauropods could run on two legs for short periods of time. Spinosaurs went extinct before tyrannosaurs showed up for the most part, so they couldn't have been outcompeted. They went extinct when seas receded and they had to adapt to land and many went extinct. This explains why Spino, having isotopic ratios more adapted for land than the others, survived later than the others. They were eventually outcompeted by carcharodontosaurs who lost their food source (giant sauropods) and went extinct, being surpassed by the abelisaurs, who kept their position in the south, while dromaeosaurs and tyrannosaurs evolved in the predator-free north, crossing from Asia.

Never really thought that Spino could be too heavy for its legs to support it. Interesting.

The predators of North America tended to be more advanced than those in South America and Africa, the primary spinosaur homelands. That may have had something to do with it. BTW, North America was pretty wet. Keep in mind it was at one point cut in two by the Western Interior Seaway.

Hmm, this will help with the disscusion. [img]http://www.reocities.com/CapeCanaveral/Galaxy/8152/PALEOBOOKCCSUCHOREXSKULLS.JPG[/img] Man, I thought Spino had a much larger head.

I have to concur with RexFan: it seems that the end of the Pleistocene brought some rather quick climatic changes with it. This had an environmental impact way too profound for some of the more massive Vertebrates to adapt to. Interesstingly enough though, it looks like of all the Megafauna that went extinct during the last 50.000 years, nearly 50% went extinct during an event appx. 12.000 years ago called the 'Younger Dryas Event'. This event marks a rebound of the climate after it started to get warmer, at the end of the ice age. That means that these animals didn't die because of the cliamte getting warmer but because of a very short-term re-cooling of the climate and the accompanying migration of vegetation zones to the south. Cheers, The_Captn

I guess Spinosaurs gave up jaw for massive arms. Those things in jp3 are HUGE!!

I think the lock ness monster is just a Greenland shark. I saw the river monsters about it and I think that a Greenland pretty well matches some descriptions.

Actually, carcharodontosaurs and tyrannosaurs do have large skulls in proportion to body and spinosaurs has short skulls, roughly 1/10 of their length, maybe a bit more. MSNM v4047 had a 6+ foot skull (only up to 6.5), Sue had a 5 foot skull, C. rex had a potentially 5.4 foot skull, Paratype Giga had a 6 foot two to four inch skull, Carcharodontosaurus SGM DIN-1 has a Giga sized skull scaling from Acrocanthosaurus but scaling from Giga his skull is smaller. 6 feet sounds good. T. Rex's skull is 1/8 of its body length Giga's is a little more than 1/7 Spino's is a little more than 1/10. Giga has potentially the longest skull in relation to body. Look at Spino and Giga here with their skulls. [img]https://lh5.googleusercontent.com/-JaqveYz6y7Q/UiLLPrEEVTI/AAAAAAAAAHI/RoH-1OVQMnw/s640/blogger-image-770535371.jpg[/img] Giga's skull is longer but its body is shorter than Spino's. *Giga is 46 feet here, Spino is 54.

How did Rex average 40-43 feet when no specimen 43 feet has been found? The average Rex is 11 (36 feet) meters. Sue is up to 42 feet and that's it. Maybe C. Rex is 43 if you add a longer tail. By no stretch of imagination did T. rex average 40-43 feet. 50 foot rex was inspired by 1.) the 22 m Rigby Rex that is no longer considered even slightly valid, and 2.) the UCMP toe bone that probably wasn't even tyrannosaurian. It was too wide, not tall enough and not long enough. The discoverer called it a T. rex bone based on size and location, which is not a good way to do things. As for Loch Ness and Megalodon, I'm leaning towards sturgeon for LN because original stories describe the monster as looking like "an overturned canoe". But Megalodon is another story, especially since I heard of William Beebe's bathysphere encounter with a 40 foot fish that swam by, resembling a shark. William Beebe is an extremely reliable scientist, having discovered several species that nobody believed existed until many years after his death.

I specialize in the Mesozoic, but as far as the final Ice Age goes, I'm guessing, as with many things, they could not re-adapt fast enough. These changes were taking place in a very short amount of time. A few thousand years or so. The dinosaurs for example had a couple million years to adapt and change between major events(excluding their extinction which happened somewhat quickly as well).

I see them doing that. Lego already had a Lego Dino series, so they have some of the needed molds ready to go. I think it'd be kinda cool.

I thought that you said that iga had a skull slightly larger than Carcharadontosaurus. I just retread your comment, never mind

Tyrannosaurs and carcharodontosaurs don't have really long skulls. Their's are more robust and more massive. Here's a short list in my book... Tyrannosaurus- 5-6 ft Giganotosaurus-5-6.5 ft Carcharodontosaurus-5-6 ft Spinosaurus- 6-7 ft Very rough list, but hopefully it get's the point across ;)

First off, we all know what my Tyrannosaurus size estimates are like. Average 40-43 ft long and 7-8 tons with 50 ft long and 9-11 tons as the max. Keep in mind Tyrannosaurus grew throughout it's life. An old Rex could be bigger than say 40 ft long. As far as evidence goes, keep in mind, every story, rumor, and myth has a shred of truth to it. Something had to inspire the tale of Loch Ness. Something had to inspire the theory that Megalodon is still alive. There has to be some truth to the theory that Tyrannosaurus could be up to 50 ft long.

SAME HERE!!! A Jurassic Park Lego videogame would be really cool as well as sets...

Yes i know that the giganotosaurus is a carnosaur but it evolve from allosaurids.

Carnosaur>allosaurid>carcharodondosaurid>giganotosaurid>giganotosaurus you understand?

I need this to be. I need the entire jurassic park become Legos. I personally live Legos.

The giga brain size from a reconstructed skull,and if 9 tonns hit a t.rex with its top speed,powerfully built or not the t.rex fell on the ground but i say again 50/50% i think that the winner is who surprise the other, And if the giga do like this it could easily defeat the rex:the giga hit the rex wit its top speed,the rex fell on the ground,the giga bite its neck,the rex try to escape but when its pull him neck from the gigas mouth its teeth slash its throat, after the t.rex try to escape but the giga again bite its neck and do the wound more deeper. and what animal can survive when cut its throat?this is why i say that the winner is who surprise the other.

I understand that but: first i dont say that once bite its neck,i say do a frontal attack and slash its neck or throat.and yes i belive that not enough one bite

They didn't have the flexibility to adapt anymore and were outcompeted quickly because of it. Many animals get outcompeted without directly competing with another species in the sense that one animal's prey depletes and so do they, and another predator raises in numbers because it doesn't risk competing as much. Eventually, the old predator is wiped out. At least that's what I've picked up from research on this stuff.

Loved it! Was awesome in Imax.

Maybe I'll replace it with "Suchosaurus", which is quite possibly an adult Baryonyx.

Spinosaurs do have proportionally short skulls, about 1/10 of their body.

1.8 m skull for Spino is probable [img]http://th00.deviantart.net/fs71/PRE/i/2013/125/4/a/spinosaurus_largest_of_the_large_by_theropod1-d6461nd.jpg[/img] Giganotosaurus [img]http://th06.deviantart.net/fs71/PRE/i/2013/122/b/3/giganotosaurus_longest_theropod_skull__by_theropod1-d63ulyu.jpg[/img] Mapusaurus [img]http://th01.deviantart.net/fs70/PRE/i/2013/190/5/b/new_giant_carnosaur_by_theropod1-d63onga.jpg[/img] Carcharodontosaurus [img]http://th01.deviantart.net/fs70/PRE/i/2013/190/5/3/giant_monitor_lizard____by_theropod1-d63hk3x.jpg[/img] Tyrannosaurus [img]http://th02.deviantart.net/fs70/PRE/i/2013/125/9/a/t__rex__the_most_iconic_skull_ever_by_theropod1-d63cbk8.jpg[/img] Saurophaganax [img]http://th07.deviantart.net/fs71/PRE/i/2013/118/a/0/huge_allosaur_skulls_by_theropod1-d63bksf.jpg[/img]

Gig's skull is 1,6 m actually. Btw, Spinosaurids has a proportionally short skull, while Tyrannosaurids and Carcharodontosaurids were quite big-headed.

I must agree with your Mapusaurus length. 46 feet seems very good

But still, it would be short. T. rex had a 5 foot skull, and it was 40 feet long. Giganotosaurus had a 6 foot skull, and 46 feet long, so wouldn't Spino at least have a skull of 7 feet long? It follows the pattern, and Spino has an extra long skull anyways.

Spinosaurus at 18 m is likely exagerrated. It need a very long tail. More like to 16 m.

That's only five feet! A five foot long thin skull on a sixty foot body.

My own is: 1. Spinosaurus 46-52 ft long / 14-16 m 2. Mapusaurus 40-44 feet long / 12,2-13,6 m 3. Giganotosaurus 41-43 feet long / 12,4-13,2 m 4. Carcharodontosaurus 40-43 feet long / 12-13 m 5. Tyrannotitan 37-41 feet long / 11,4-12,4 m 6. T.rex 36-40 feet long / 11-12,3 m 7. Chilantaisaurus 36-40 feet long / 11-12 m 8. Suchomimus 36-40 feet long / 11-12 m 9. Deinocheirus 33-40 feet long / 10-12 m 10. Bahariasaurus 27-40 feet long / 8-12 m

8 feet long? Nope, it's more like to 1,58 m according to new estimate by Hartman.

New animals for the heated world basically ate the plants and eveded predators better than the old ones. The new predators and new herbivores basically just killed off the old herbivores and carnivores. And the plants changed, so they also killed of the herbivores.

Okay, I always thought that spinosaurus had a head 8 feet long, but I guess you don't agree.

Okay, DinoFights that is very interesting, and that means that Spino would be by far the largest dinosaur. As for T. rex size, have we ever found the biggest of its species, ever? I bet the the very, very maximum a T. rex ever got is 45 feet long. That really goes the same for Giganotosaurus, but I think Giganotosaurus had an average of around 46-47 feet long. Going for Oxalaia, Saurophaganax, this also works, but I really didn't use that because I believe that they make it i that long sometimes, but not always. If Tarbosaurus was 40 feet and 4.5 tons, then a 30 foot Iguanadont named Lurdusaurus would be heavier then it at 5-6 tons.