Close

Search:

Type: Posts; User: Dr. Wallace

Search: Search took 0.00 seconds.

  1. Replies
    143
    Views
    33,672

    Yes, they could. Both crocodilians and birds have...

    Yes, they could. Both crocodilians and birds have excellent color vision.
  2. Replies
    143
    Views
    33,672

    It's unclear at this point, but they were...

    It's unclear at this point, but they were probably bird-like for the most part. Most reptiles have "bird-like" eyes; only a few groups (such as geckos, crocodilians, and some snakes) have the slit...
  3. Replies
    143
    Views
    33,672

    The Nanotyrannus skulls have a different number...

    The Nanotyrannus skulls have a different number of teeth than those of T. rex, and there's a small foramen in the back of the skull which isn't present in T. rex. There's also some morphological...
  4. Replies
    143
    Views
    33,672

    Well, there's very little doubt that it's a...

    Well, there's very little doubt that it's a juvenile, it's just a question of whether it's a distinct species or not, since it does have some features that T. rex doesn't.
  5. Replies
    143
    Views
    33,672

    Nanotyrannus has a few differences that might...

    Nanotyrannus has a few differences that might make it a distinct species from T. rex (number of teeth and some differences in skeletal structure), but it's still up in the air at this point.
  6. Replies
    143
    Views
    33,672

    Jack Horner's main component of that theory, the...

    Jack Horner's main component of that theory, the Torosaurus/Triceratops thing, has already been more or less proven untrue (not that it's stopped Jack Horner), and let's not forget the whole "T. rex...
  7. Replies
    143
    Views
    33,672

    Dinosaurs' tails are more like those of...

    Dinosaurs' tails are more like those of crocodylians than those of lizards to begin with; they tend to be taller than they are wide, instead of being round like lizard's tails. I'm gonna assume...
  8. Replies
    143
    Views
    33,672

    Keep in mind that Jack Horner's theory has some...

    Keep in mind that Jack Horner's theory has some serious flaws, and he's been known to... stretch the truth when it suits him.
  9. Replies
    143
    Views
    33,672

    Why would it need to be? Mosasaurs were big...

    Why would it need to be? Mosasaurs were big animals; venom wasn't necessary for them. Also, it's FAR more difficult to produce enough venom to kill large prey than it is to produce enough to kill...
  10. Replies
    143
    Views
    33,672

    Probably the same ways modern birds and reptiles...

    Probably the same ways modern birds and reptiles do.
  11. Replies
    143
    Views
    33,672

    They weren't strong enough for that, or even for...

    They weren't strong enough for that, or even for whipping. According to calculations based on the speeds achieved and the forces involved, a sauropod that tried to whip its tail would break the...
  12. Replies
    143
    Views
    33,672

    Not only that, but Kulindadromeus shows that...

    Not only that, but Kulindadromeus shows that feathers were basal to all dinosaurs; that is, non-feathered dinosaurs lost their feathers instead of never getting them in the first place.
  13. Replies
    143
    Views
    33,672

    Those "tails" aren't actually tails; they're just...

    Those "tails" aren't actually tails; they're just strips of flesh without any bone or muscle in them.
  14. Replies
    143
    Views
    33,672

    There are a number of fossils that show apparent...

    There are a number of fossils that show apparent deformities, with even more that show deformities due to injury or postmortem changes. I can't think of any specific examples though.

    Underwater...
  15. Replies
    143
    Views
    33,672

    It would require the troodontids to become much...

    It would require the troodontids to become much bigger and have some sort of advantage over the tyrannosaurids. For example, if forests became as prevalent as they did in the Eocene, troodontids and...
  16. Replies
    143
    Views
    33,672

    How did they mate? Very carefully, of course. But...

    How did they mate? Very carefully, of course. But in all seriousness, they probably just had long penises/cloacal extensions and/or positioned themselves carefully.

    (I'm not sure how appropriate...
  17. Replies
    143
    Views
    33,672

    It's either related to...

    It's either related to allosauroids/carcharodontosaurids/neovenatorids (all basically the same thing in this context) or tyrannosauroids; Wikipedia has it grouped with the tyrannosauroids.
  18. Replies
    143
    Views
    33,672

    Yes; it's highly probable that a number of...

    Yes; it's highly probable that a number of ornithscians were omnivorous. I'm not sure about full-on carnivory though, since theropods filled most of those niches, and pterosaurs or crocodilians...
  19. Replies
    143
    Views
    33,672

    Well, it looks like integument was basal to...

    Well, it looks like integument was basal to archosaurs, seeing as pterosaurs had "fur", dinosaurs had feathers, and crocodilians have dormant feather genes. Chances are the vast majority of dinosaurs...
  20. Replies
    143
    Views
    33,672

    A fairly long time. Even though we have preserved...

    A fairly long time. Even though we have preserved tissue, the DNA in said tissue has been heavily degraded, and just putting a mammoth embryo in an elephant could cause unforeseen complications; it's...
  21. Replies
    143
    Views
    33,672

    In general, bigger jaws=stronger bite force,...

    In general, bigger jaws=stronger bite force, although it's hard to tell exactly how strong any dinosaurs' jaws were since we can't look at their muscles.
    As for the sauropod thing, it's again hard...
  22. Replies
    143
    Views
    33,672

    Not really... It had really short limbs, and had...

    Not really... It had really short limbs, and had a weird downturned lower jaw that indicates it may have fed on fish.
    ...
  23. Replies
    143
    Views
    33,672

    Basically, yeah. There's always some intraspecies...

    Basically, yeah. There's always some intraspecies variation, but they were roughly that size. Remember that Utahraptor was much more heavily-built than the JP raptors, and that dromaeosaurs, like...
  24. Replies
    143
    Views
    33,672

    The JP raptors were much bigger than Deinonychus,...

    The JP raptors were much bigger than Deinonychus, which was roughly the size of a large dog. The JP raptors are closest to Utahraptor in size, although they don't resemble it at all.
    ...
  25. Replies
    143
    Views
    33,672

    Remember that with as animals as large as some of...

    Remember that with as animals as large as some of the big dinosaurs, staying warm isn't much of a problem. Large dinosaurs could have easily survived in cold regions with minimal insulation.
Results 1 to 25 of 25