The Triceratops' large, thick knobs spaced around its back and sides: They would not be enough to prevent a T-rex from biting down and piercing the back, but they might be hard enough to break off one or more teeth, which would be painful to the predator, making it hesitate to attack a Triceratops next time if any other prey was available. Pain is a very powerful conditioning force in living things, as I have found out from considerable negative personal experience.
Glad to hear they are a help. It's been a while since I uploaded these, it might be time for me to go back and make some changes. We have learned a lot about dinosaurs in that time. The issues around when feathers evolved are still a hot research area so it's always fun to think about our reconstructions. The AMNH is a real treasure, I am glad you get to help people learn while there.
One friendly remark...the skull shown at 15:15 is not a toucan's but a hornbill's (probably a great hornbill or a related subspecies). Google it. Just a little detail, but worth noting.
when he talks about dinosaurs being colorful because they are visual animals, i immediately had to think of monkeys. they also often have bright colors. blue (Mandrill), red (Bald Uakari) or other beauties like: Red Shanked Douc, or Gee’s Golden Langur
I saw my first tyrannosaur skull in Bozeman, many years ago, and I sensed immediately it was a birds head. I felt it was shaped and except for the teeth was a big bird.
You state in here that early archosaurs are expected to exothermic because crocodylians are yet the explanation for the advanced heart in crocodylians is endothermic ancestors Edited for typo
If true, sorry for the confusion. The increased efficiency in archosaurs appears to be stepwise, ultimately leading to a few of the groups gaining endothermy at different times (although not settled). For instance, dinosaurs and pterosaurs probably both had endothermic members, but the common ancestor probably did not. And some dinosaurs appear to have given up endothermy. (www.sciencedirect.com/science/article/pii/S1342937X20302252; doi.org/10.1016/j.cub.2024.04.051; www.nature.com/articles/s41586-022-04770-6)
Without direct fossil evidence of feather coverage on any particular lineage of dinosaurs, this new fashionable interpretation is likely a huge over correction and will seem embarrassing in 50 years from now. Too extreme changed interpretation, too quickly.
Without direct fossil evidence?! We have many specimens of coelurosaurs and even ornithischians with feather-like structures and even modern-looking feathers!
The Dinosauromorpha tree shown in the video is not replicated in the large reptile tree: www.reptileevoluton.com/reptile-tree.htm. Pterosaurs are not related to dinosaurs in that tree. Rather crocs are related to dinos as their proximal outgroup. Taxon exclusion is the problem here. Add more taxa and the Evans tree topology will change. In the Evans tree the closest outgroup to the pterosaurs are the unrelated phytosaurs. That's a sign that the topology lacks a sufficient number of taxa for a gradual accumulation of derived traits. There are no such problems in the large reptile tree. In bird embryology feather shafts first appear across the lower back, not on the face, across naked, not scaly skin. Embryology typically recapitulates phylogeny. Otherwise, nice talk!
The Triceratops' large, thick knobs spaced around its back and sides: They would not be enough to prevent a T-rex from biting down and piercing the back, but they might be hard enough to break off one or more teeth, which would be painful to the predator, making it hesitate to attack a Triceratops next time if any other prey was available. Pain is a very powerful conditioning force in living things, as I have found out from considerable negative personal experience.
So, exactly how many triceratops have you bitten into? Asking for a friend.
You deserve more viewers! Very interesting and its nice to hear up to date look.
Thank you. I’m a museum guide at AMNH in nY. I’m talking to the public. Your talks are wonderful
Glad to hear they are a help. It's been a while since I uploaded these, it might be time for me to go back and make some changes. We have learned a lot about dinosaurs in that time. The issues around when feathers evolved are still a hot research area so it's always fun to think about our reconstructions. The AMNH is a real treasure, I am glad you get to help people learn while there.
Sound is very very low..
Can't watch.... volume too low to hear, and I'm not gonna have ads blare at me by turning up the volume. Sad. 😢
ruclips.net/channel/UCmVa-cbCpkd5Cd9Fr_4tCWg
Take a look at this channel for really excellent in-depth discussions about how different species looked.
One friendly remark...the skull shown at 15:15 is not a toucan's but a hornbill's (probably a great hornbill or a related subspecies). Google it. Just a little detail, but worth noting.
when he talks about dinosaurs being colorful because they are visual animals, i immediately had to think of monkeys. they also often have bright colors. blue (Mandrill), red (Bald Uakari) or other beauties like: Red Shanked Douc, or Gee’s Golden Langur
I love dinosaurs. I wish I could see them alive up close, besides birds that is.
Whether or not dinosaurs had scales or feathers, they would still be scary.
I can hardly hear this you must have uploaded with volume at like 30%
Nothing too hear anyway
Bluesky
Why are you here in the first place, if that's the case?
i can hear it if i turn my volume all the way up (on my laptop). maybe try headphones
Thank you for this.
+Lightcrunch Not a problem, its my pleasure.
I saw my first tyrannosaur skull in Bozeman, many years ago, and I sensed immediately it was a birds head. I felt it was shaped and except for the teeth was a big bird.
You state in here that early archosaurs are expected to exothermic because crocodylians are yet the explanation for the advanced heart in crocodylians is endothermic ancestors
Edited for typo
If true, sorry for the confusion. The increased efficiency in archosaurs appears to be stepwise, ultimately leading to a few of the groups gaining endothermy at different times (although not settled). For instance, dinosaurs and pterosaurs probably both had endothermic members, but the common ancestor probably did not. And some dinosaurs appear to have given up endothermy. (www.sciencedirect.com/science/article/pii/S1342937X20302252; doi.org/10.1016/j.cub.2024.04.051; www.nature.com/articles/s41586-022-04770-6)
@@thomasevans3387 thanks for the article
All thanks to Tiktallik
Dr Neil Shubin + his team
The Grand Daddy of all 4 limbed land creatures
Lmao @ thagomizer. You really snuck that one in there.
Excellent/Interesting information! Excellent speaker!
^..^~~
Without direct fossil evidence of feather coverage on any particular lineage of dinosaurs, this new fashionable interpretation is likely a huge over correction and will seem embarrassing in 50 years from now. Too extreme changed interpretation, too quickly.
Without direct fossil evidence?! We have many specimens of coelurosaurs and even ornithischians with feather-like structures and even modern-looking feathers!
And too quickly my ass. Feathered dinosaurs is an idea at least as old as Archaeopteryx's discovery.
Lmao we have TONS of evidence of feathers…
The Dinosauromorpha tree shown in the video is not replicated in the large reptile tree: www.reptileevoluton.com/reptile-tree.htm. Pterosaurs are not related to dinosaurs in that tree. Rather crocs are related to dinos as their proximal outgroup. Taxon exclusion is the problem here. Add more taxa and the Evans tree topology will change. In the Evans tree the closest outgroup to the pterosaurs are the unrelated phytosaurs. That's a sign that the topology lacks a sufficient number of taxa for a gradual accumulation of derived traits. There are no such problems in the large reptile tree.
In bird embryology feather shafts first appear across the lower back, not on the face, across naked, not scaly skin. Embryology typically recapitulates phylogeny.
Otherwise, nice talk!
I don't know when the first appeared, but they died out about 13,000 years ago
Bluesky no they didn't dumb ass
Trumplings??? No they are still around in some parts of the USA, they form pests..