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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,317 Views)
CyborgIguana
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Any decent skeletal refs for a juvenile T. rex around?
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TheNotFakeDK
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200% Authentic

Scott Hartman's done a skeletal of Jane if that suffices, or are you looking for younger?
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CyborgIguana
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Yeah, that's within the size range I'm looking for. Thanks! :)
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Fluffs
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Pull my finger!

Is there a chance that certain dinosaurs like Protoceratops and Velociraptor lived to the K/T extinction?
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CyborgIguana
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A small chance I suppose, but I doubt it since the environment changed rather drastically in those several million years before K-T (namely the Gobi changed from a semi-desert habitat to a somewhat wetter woodland oasis IIRC).
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Yi Qi
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CyborgIguana
Feb 2 2016, 06:52 PM
A small chance I suppose, but I doubt it since the environment changed rather drastically in those several million years before K-T (namely the Gobi changed from a semi-desert habitat to a somewhat wetter woodland oasis IIRC).
Not exactly that, it didn't change at all, it was mainly that there was a central wetter floodplain area and outlying deserts and scrubland, think about the okavango and the nearby namib and Kalahari desert for a better comparisson.

So the deserts that V raptor and crew inhabited were pretty much there till the very end of the cretaceous.
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CyborgIguana
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Oh, well if that's the case maybe it's more likely than I thought that they could've survived.
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stargatedalek
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I'm not slow! That's just my moe!

Jony
Feb 2 2016, 02:48 PM
We currently have evolution in biology. And sth interesting have attracted my attention on a worksheet. This worksheet was - among other things - about the evolution of proboscidea. And they claim there that the Mastodon survived up to 800 A.D.
I took a little research and didn't really found any evidences. Now I wondered whether you think that this thesis is true or not.
800 CE? Afraid not. Mastodon almost certainly didn't survive much longer than 10,500 years ago when the first peoples colonized North America. If I recall correctly the youngest Mastodon remains are actually from my neck of the woods 【Nova Scotia】 which would have been among the last areas colonized so if they didn't last longer here it's unlikely they did anywhere. Mind you I'm not one for converting "X years ago" into BCE/CE so I could have misinterpreted.
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Mathius Tyra
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Rat snake is love... Rat snake is life

So, is the fish-eating theory the most possible about Dilophosaurus's diet?
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Incinerox
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Āeksiot Zaldrīzoti

No.

It lived in the Kayenta Formation - a near-desert scrubby dustbowl just south from one of, if not THE biggest dune field in Earth's history.

Fish weren't common. Large fish didn't exist there at all.

And it was literally the second largest animal in its environment by quite some margin so... Yeeeaahh... :/
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Mathius Tyra
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Rat snake is love... Rat snake is life

Then what about the study that say its jaws is too weak to tackle big and strong prey?
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Incinerox
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Āeksiot Zaldrīzoti

I'll let this do the talking:

Posted Image

The only three land species it misses out on are an undescribed prosauropod (usually attributed to, but is easily 2-3 times larger than Sarahsaurus, and was likely the largest animal in the area - known from a skull much like that of Lufengosaurus), an undescribed heterodontosaurid (small, tianyulong-like, mentioned in a massive thesis by Sereno - known from good remains, but only a picture of its dentary is on the internet), and Kayentavenator (not that much larger than Coelophysis - known from a pelvic girdle and upper leg which suggests a more advanced theropod IIRC).
Edited by Incinerox, Feb 4 2016, 08:33 AM.
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Mathius Tyra
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Rat snake is love... Rat snake is life

Ah, I see.... Our double crest dude is gigantic comparing to its preys that have been found in the same area. That makes it doesn't have to care much about its jaws strength to subdue prey, right?
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Incinerox
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Āeksiot Zaldrīzoti

Well that, and my thinking was that if it did go for something larger like, say, a juvenile of that really big propsauropod I mentioned, it was likely not using its jaws to grab struggling prey (which was what the piscivory study challenged, weirdly enough, given that fishing is all about grabbing struggling prey).

When you see how long and blade-like its teeth were (not great for catching fish anyway - you want conical spike-like teeth for grip, like what you see in spinosaurids and crocs), and considering that its jaws were better for really quick, fast bites (rather than puncturing and gripping, or crushing), it appears to me that you have a group of theropods that brought death by laceration to larger prey items. Though it wasn't using the momentum of its whole head like with carnosaurs, which lacerated their prey with open jaws being swung downward like a hatchet as proposed by some. Dilophosaurus was likely just taking quick, slashing bites, backing off, then repeating until the target dies from shock and bloodloss.

It would've been a rather grueling death for whatever it was hunting.

I imagine prosauropods up to about its own body length were its preferred prey option - Scelidosaurus, despite being rather small, was likely comparatively safe thanks to being armoured. An adult of this "prosauropod X" would've been a FORMIDABLE opponent.
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CyborgIguana
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I suddenly want an updated JP remake, so I can see a Dilo using that tactic on Nedry. :P
Edited by CyborgIguana, Feb 4 2016, 09:44 AM.
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