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 Dinosaurs and other Prehistoric Animals

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Meles meles
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyTue 18 Jul 2017, 17:39

It has also been suggested - originally many years ago - that T rex and other large theropods were principally ambush hunters, for which a good sense of smell and/or night vision would certainly not be disadvantageous. So like modern leopards or komodo dragons, they just found a bit of cover next to a well-used trail, hid, and waited ...  and then when some suitable prey passed, all that was needed was a short burst of speed and a quick killing bite, or even just a disabling bite. No great stamina for the chase, nor speedy ability to outrun the prey, was ever needed as it all depended on the sudden lunge and devastating bite. And you cannot deny that T rex was apparently capable of a quick, very powerful bite. Modern komodo dragons are easily outrun by adult humans if pitted in a straight race, yet komodo dragons regularly catch and kill flighty animals like wild deer, goats, pigs and wild fowl ... and indeed sometimes even humans.
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PaulRyckier
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyWed 19 Jul 2017, 10:46

@Meles meles wrote:
It has also been suggested - originally many years ago - that T rex and other large theropods were principally ambush hunters, for which a good sense of smell and/or night vision would certainly not be disadvantageous. So like modern leopards or komodo dragons, they just found a bit of cover next to a well-used trail, hid, and waited ...  and then when some suitable prey passed, all that was needed was a short burst of speed and a quick killing bite, or even just a disabling bite. No great stamina for the chase, nor speedy ability to outrun the prey, was ever needed as it all depended on the sudden lunge and devastating bite. And you cannot deny that T rex was apparently capable of a quick, very powerful bite. Modern komodo dragons are easily outrun by adult humans if pitted in a straight race, yet komodo dragons regularly catch and kill flighty animals like wild deer, goats, pigs and wild fowl ... and indeed sometimes even humans.

Meles meles,

occasionally wanted to post yesterday something about the T-Rex for Triceratops. Just seen on BBC World:
http://www.bbc.com/news/science-environment-40632751


Kind regards to both from Paul.
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Triceratops
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyThu 26 Oct 2017, 10:17

Footprints of 200 million year old Mega-carnivore found in Lesotho:

Lesotho Dinosaur
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ferval
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyThu 26 Oct 2017, 10:52

This morning's In Our Time;

Featherd Dinosaurs
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Triceratops
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyThu 26 Oct 2017, 11:15

I've let my BBC membership lapse. Can't play it.

Thanks none the less, Ferval.
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Triceratops
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyFri 01 Dec 2017, 14:32

215 fossilised Pterosaur eggs found in China:

Pterosaur Eden
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Triceratops
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyThu 07 Dec 2017, 12:28

Swan like dinosaur with duck bill and croc teeth:

Halszkaraptor
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Triceratops
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyThu 07 Dec 2017, 16:09

Check this for a marsupial:

kangaroo-lion
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Triceratops
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyFri 25 May 2018, 13:06

Ground dwelling birds survived the Asteroid Event 66m years ago:

Dino-Birds

Dinosaurs and other Prehistoric Animals - Page 3 04-dinosaurs-birds-asteroid.adapt.1900.1

However, others say that the mass deforestation only applied to North America;

Dino-Birds II
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nordmann
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyFri 25 May 2018, 13:55

You'll be relieved to know that your ancestors suffered from the dreaded powdered shoulder syndrome, Trike, so you can blame them if you've inherited same!

Well, at least the Cork ones did ...

UCC discover dinosaur dandruff
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Triceratops
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyFri 25 May 2018, 14:46

Fully covered:

Dinosaurs and other Prehistoric Animals - Page 3 2359deefaa48f7b81a8887b2eef84a2b

Seriously though, the skin shedding does make Dinosaurs more closely related to Birds and Mammals than to Reptiles.
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PaulRyckier
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyFri 25 May 2018, 19:50

@Triceratops wrote:
Fully covered:

Dinosaurs and other Prehistoric Animals - Page 3 2359deefaa48f7b81a8887b2eef84a2b

Seriously though, the skin shedding does make Dinosaurs more closely related to Birds and Mammals than to Reptiles.


Triceratops,

somewhere we two made a whole survey of the evolution from dinosaurs to birds...but don't know anymore under what rubrique...historical photos?...in any case here another link to this evolution:
https://www.youtube.com/watch?v=XAzGC89n0S4&t=4s

Kind regards from Paul.
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PaulRyckier
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyFri 25 May 2018, 20:09

@Triceratops wrote:
Ground dwelling birds survived the Asteroid Event 66m years ago:

Dino-Birds

However, others say that the mass deforestation only applied to North America;

Dino-Birds II

Triceratops and nordmann,

you don't believe it, but I read these two subjects in our Belgian Dutch language newspaper this afternoon. And the Dino-Birds and the skin thingie. Even on my computer start pagina of BBC World news I didn't see it. Yes each afternoon the newspapers in the "café" as in the time in Vienna...but not the Vienna café discussions...each one at his own table...

Kind regards from Paul.
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Triceratops
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyThu 16 May 2019, 14:15

Baby Green Heron or a  velociraptor


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Meles meles
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyThu 16 May 2019, 16:31

I think of velociraprors - or at least Spielberg's 'Jurassic Park' type ones - whenever I see a group of magpies. 

My original three cats (mother and two daughters) had mastered the frontal lure "come on then" tactic, with the other two attacking simultaneously from the sides/rear. Using this fairly simple strategy they very successfully dealt with a large male fox that once dared wander up into their territory near the house (he never came back). But when you see a group of magpies in operation, it is even more brutally efficient and so intelligently coordinated that their group strategy does seem to be at an even higher level. I once saw a group of six or seven magpies tackle an adult alsatian dog ... they not only drove him off whatever tasty-something he'd found and even forced him to drop the few morsels he'd already picked up, but they then remorselessly hounded the poor dog until he was simply desperate to get away ... and even then they wouldn't let him go without a few extra pecks, for remembrance, as he fled down the road. But then although having successfully seem him off, they continued to keep posting lookouts - which they changed from time to time - to keep an eye on him just in case he dared to try his luck again.

As I say, Jurassic Park's velocirapters ("Clever girl") does rather come to mind.

Also remember that while all modern birds, including magpies, have lost the long bony tail of their dinosaur ancestors - which in velociraptors was actually stiffened by a cross-braced network of tendons to form a fairly inflexible but very practical stiff 'balancing-pole' - it has been closely re-evolved with the stiff quills of a bird's feathered tail.

But further to your baby Green Heron ... young Hoatzin birds even have claws/nails/talons on their muscular hands/wings (ie in addition to the normal claws on the toes of their feet) which they use to climb amongst tress branches:

Dinosaurs and other Prehistoric Animals - Page 3 Hoatzin

That said I think that the DNA of all birds' still contains the genes to make structures such as nailed claws on their forehand/wings (ie not just on their feet), and also true teeth (with dentine) in their jaws. Usually the genetic code is 'turned off' but it can be reactivated ... such as during the hoatzin's natural development (for claws on its hand), or in the laboratory when embryonic chickens have been raised with teeth in their jaws.
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyFri 17 May 2019, 09:11

Velociraptors themselves are fairly small. Utahraptors on the other hand.

A selection of dromaeosaurids:

Dinosaurs and other Prehistoric Animals - Page 3 799px-Dromaeosaurs
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PostSubject: Re: Dinosaurs and other Prehistoric Animals   Dinosaurs and other Prehistoric Animals - Page 3 EmptyFri 15 May 2020, 14:05

Pictures of various (1365) dinosaurs:

Dinosaur Database
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