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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,374 Views)
Paleop
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Paleopterix

Jules
Aug 9 2015, 01:44 AM
Remember that mammals can be a good comparison in this case; Tyrannosaurus was an apex predator, and as such would be closer in habits to a tiger or a polar bear than to an alligator.
It's pretty obvious that it did hunt - Edmontosaurus with healed wounds - but, like any other predator, it would also have scavenged if it could.

right:better to compare by niche
although differing from your opinion: I think a grizzly might be a good possibly better comparison than a polar bear.(due to a more similar climate)(after all: environment shapes the animal)
probably not the best comparison between animals (based on assumed niche)(should also mention that this is Yellowstone fauna):
grizzly~t rex
coyote~ acheroraptor?
bison~ triceratops
moose~ edmontosaurus
Bighorn sheep~ pachycephalosaurs

anyways: isn't it likely that there were other small predators besides acheroraptor?
Edited by Paleop, Aug 9 2015, 10:14 AM.
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kepperbob
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- Pure Shardana -

edmonto could be more swited for wapiti than moose, since moose are semiaquatic.
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Incinerox
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Āeksiot Zaldrīzoti

We lack an equivalent mountain lion in Hell Creek. Or wolves for that matter.

Just throwin' it out there.
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Ulquiorra
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There was something I was thinking about the other day and I've been forgetting to ask here,

Were there any mammals that could be considered marine or semi aquatic mammals during the time of the dinosaurs or were all cretaceous mammals terrestrial/arboreal?
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54godamora
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yes.Castorcauda: a docodont that behaved like a beaver.
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SpookDoc
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So the only known terrestrial predators from the Hells Creek Formation are Tyrannosaurus rex and acheroraptor?
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54godamora
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don't forget Anzu.
And * drumroll* Nano-t.

I believe that Nano-t is its own genus.
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Posted Image Flish
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SpookDoc
Aug 9 2015, 11:58 AM
So the only known terrestrial predators from the Hells Creek Formation are Tyrannosaurus rex and acheroraptor?
No, the two largest carnivores are Tyrannosaurus and Archeroraptor, Anzu and Struthiomimus were both larger than Archeroraptor but were likely omnivorous.
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Furka
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We do know at least three crocodilians, however one of them was a Gavialid IIRC, and the other two (Borealosuchus and Brachychampsa) were not especially big.
EDIT: let's not forget Paleosaniwa.

BTW I don't think bears make good comparison for rexy, bears are omnivores and they tend to be less territorial than fully carnivorous predators like big cats.
Edited by Furka, Aug 9 2015, 01:50 PM.
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BossAggron
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Formerly Dilophoraptor

Incinerox
Aug 9 2015, 11:17 AM
We lack an equivalent mountain lion in Hell Creek. Or wolves for that matter.

Just throwin' it out there.
Is that not what the juvenile Tyrannosaurus/"Nanotyrannus" are for?
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heliosphoros
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Ulquiorra
Aug 9 2015, 11:32 AM
There was something I was thinking about the other day and I've been forgetting to ask here,

Were there any mammals that could be considered marine or semi aquatic mammals during the time of the dinosaurs or were all cretaceous mammals terrestrial/arboreal?

Didelphodon.
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Incinerox
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Āeksiot Zaldrīzoti

Damnit, you beat me to it.

Didelphodon seems to be very otter-like, now that we actually have more than just the few skull bones Walking With Dinosaurs had to work with.
Edited by Incinerox, Aug 9 2015, 04:57 PM.
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heliosphoros
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Even then, the teeth are similar to those of a sea otter.
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JPFAN85
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I have received several different answers to this topic, so hopefully someone can help me find an answer to this once and for all: Is the Nemegt Formation in Mongolia considered a part of the Flaming Cliffs? Or are the Flaming Cliffs a different formation/fossil site altogether?
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54godamora
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the nemegt formation is in the early masschritan era, while the Flaming Cliffs are in the Campanian era.
That, and the flaming cliffs are part of the Djadochta formation.
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