Oxalaia vs Daspletosaurus

"COUGH" SHARKS "COUGH"

but not every predator is not willing to go after prey as big as themselves. it's common since that a predator would more likly go after smaller, easier, more recognisable prey items then those that aproach it's own size. and you seem to forget that their are sharks intersepting the areas the crocodiles swam in such as tiger sharks and bull sharks. we even have evidence of ancient sharks being able to predate on mosasaurs. the reason that mosasaurs don't target spinosaurs can be the very same reason as why sharks don't target crocodiles. they do not veiw it as a potential food source or does not veiw it as a prey item that worths it.

and as i said, it is commenly veiwed as that, but its not certain due to this new possability.

how do you know that? mosasurs weren't even the dominant predators at this time. their in direct compatition with sharks and other predators like them. and just to let you know, mosasaurs weren't even large until 80 million years ago. no mosasaur found thus far is considered large enough to rival spinosaurus 98-97 million years ago. they only became the large and dominant during the last 20 million years. so your statement on mosasaurs being a limited factor is fallacios


no, the point is despite this occurrence, they survive. predation alone is not the only factor to assert that an animal that does have the capabilities for aquatic travel. and aparently, mosasaurs were not large enough to do this at this time

and few were large enough to consider spinosaurus a potential or essential prey item





elongated body, short legs, a long, powerful tail. all the means where both spinosaurus and a crocodile are very similar. heck, even the leg length to body size ratio seem similar. seems that it could have the adaption to swim a SMALL ocean semi aquatic



yeah, because its a hypothosis that challenges the original idea, and it makes since. obvously needs more evidence but it is a possibility. the reason why is directly due to the lack of fossil finds for oxalia, dispite the fact that it alone is already so close in morphalogy to spinosaurus tht it raises some eyebrows. 

what? the thing that makes this point fallacious is that although there are a lager quantity of predators at this time period, the majority are SMALLER then spinosaurus, including the mosasaur species at the time. therefore it is alot less likely for them to attack spinosaurus due to it's greater size. if spinosaurus does partake in oceanic travel, i think a it can survive crossing a small ocean without worrying about alot of predators targeting it, being that it's larger.


i'm sorry, but your mistaken. fully aquatic animals are not stronger comparatively then semiaquatic animals. their denser but the overall muscleature might even go to the semiaquatic animals advantage. being that it can support its weight on land which has a greater gravitational pull then the water. why else do you see a crocodile walking on land and a beached whale dying on the beach? a fully aquatic animal doesn't have the strength to move with it's weight, while a semiaquatic one can. i'm not missing anything. let me ask you, why would a smaller, fully aquatic animal attack a larger, unrecognizable organism when it could go on it's way and predate on it's usual diet? the mosasaurs at this time were not the top predators and have not shown any evidence of taking animals it's size or larger. for all we know, mosasaurs at this time could be primarily piscovores. their getting killed by sharks smaller then they are. i'm sorry, but assuming that is a common behavior for a mosasaur at this time is no more then a assumption with little to no evidence. so i'm gonna just say that i'm not buying it


you feel free to do so. despite the sail ( and given how thin it is from the frontal view, i'm not considering is a major hydrodynamic disadvantage), they are very similar. even the isotope ration of the bones of spinosaur and crocodilians are identical. and crocodilians are proven to be able to accomplish oceanic travel


this is no longer known for certain due to this new proposal. it's a POSSIBILITY. this new proposal is a POSSIBILITY. both explain why oxalia looks so similar to spinosaurus,and both have some sort of evidence to support it. i'm being open minded to both ideas. so i don't see the POSSIBILITY you brought up is the one and only one. it what you must be intending, being that you keep quoting this question.

just felt like being an asshole for a moment. theropod, hears the big bad fully aquatic predator that coexisted with spinosaurus and oxalia. look at the evil glint in it's eye. it could probably take out a megalodon if it wasn't for the dang meteor.

That made me laugh! But, even if there were large aquatic predators in this tiny ocean at this time, they would avoid attacking a big animal like spinosaurus. If it so well adapted to semi-aquatic life as we think , even if it was not so agile as a mosasaurus, it would be a more than reasonable challenge. Today, you can see that predators avoid other predators in 90% of the time at least.

Well I think Oxalaia takes this.