by The Kingpin » Sun Jul 10, 2011 9:15 pm
-_-
OK. I'll be fair. I'll let you keep your opinion. You have a right to your own opinion and beliefs. But let me just reclarify to you the reason I and likely most of the paleontologically aware community think it's ridiculous:
1) Quetzalcoatlus and other pterosaurs are large, yes. they would've been heavy from our point of view, yes. but not compared to the surface area of their wings. the lift produced by such massive wings is substantial. simple example close to home can be seen in modern aircraft, which are INSPIRED by gliding creatures that, though unrelated, were very much like Pterosaurs in overall design.
Condors for example. wingspans of 10 feet being regularly noted, with weights reaching and sometimes exceeding 24 lbs, or 15 Kgs for those of you like myself who use the SI [International System of Measurement]. The weight of animals like these, both past and present, were likely well within range of the potential lift generation of their wings.
2) Unless you want to argue that Pterosaurs had no wing membranes and could run with those enormous wing bones flailing all over the place, There is no way you can affirm a pterosaur's ability to move with any semblance of speed. it would not be able to run, and even it's walking would be hindered by the wing membranes [ever try running with a large amount of fabric around your legs? trust me. it's difficult. that's why you don't see Arab sports teams running around in formal clothing. or why you never see stories of Ancient Japanese fighting in completely closed, sealed kimonos. or why female Olympic Runners don't run with full length gowns instead of shorts. it's impossible to move quickly when your limbs are so heavily bound]. Try tying a horse's legs with large sheets of fabric, then try and make it run. I'll save you the trouble. it won't. it'll probably hobble, but that's about it.
3) Pterosaur beaks made up as much as half their total body length. the purpose for these beaks was to give more room to gather fish. I would suggest a theory that they were pelican-like, and had large pouches to capitalise on their massive beaks' potential as a fishing tool. but that's just one possibility among many to be applied to animals that were primarily piscivorous. their beaks would've made unwieldy weapons in a fight. try swinging everything from your hips upwards at someone as a weapon. try striking several blows in rapid succession. watch as you fall over, dizzy, exhausted and amidst laughter as your opponent looks at you wondering wtf you were doing. something similar would've happened if Ornithocheirus, Quetzalcoatlus or other giant pterosaurs tried to use their beaks as weapons.
I have already mentioned the noxious gas possibility and it's improbability [so what, giant land-bound, crippled bird-like death-skunks? no. just no.] I've also stated above why speed was likely absent from a 'land-bound' Pterosaur's dictionary. If you were to line it up for a race against a similar-sized turtle [assuming for a moment that the activity and mobility of said turtle is not diminished from it's smaller kin], I'd personally put my money on the turtle to win.
4) While I highly respect Michael Crichton as an author and as the writer whose most heavily influenced my childhood [admittedly by extension of the JP movies. I am unlucky enough to not have access to the JP books themselves], I must remind you that he is by no means the most knowledgeable person in the field of dinosaur ecology. Fiction is not a source for facts. if that were the case I could go off and say 'Well, Rexes and other large predators could possibly have networked their territories in mutual interest if there was a more dangerous risk facing them all'. possible? perhaps. likely? no.
IK, answering your question, the result would depend on the growth rate of Spinosaurs. assuming for a moment that adult size is 57 feet [a fairly conservative number, not too high, nor too low], and the age of adulthood is age 20, and that growth rate was even throughout it's life [as opposed to the sharp changes seen in T. Rex's growth, which, in itself, is an anomaly even among other species in it's own family], then the JP3 Spino would likely have been about 15 years old. the Rex being 39, I'd take a guess at it being around 18 years of age, since it's fairly close to the believed maximum size of T.Rex. however, if the recent information is accurate, Rex could've been between 46-50 feet in length. that, in turn, would change the measurement, placing the JP3 Rex at about 16 years of age [with the remaining 7 to 11 feet being reached through the remaining 4 years of it's active growth period].
"Ah yes, organised chaos. the sign of a clever but ever-busy mind. To the perpetrator, a carefully woven web of belongings and intrigue, but to the bystander? Madness!"
–William Beckett, Lore of Leyuna RPG