Why Didn't The Dinosaurs Ever Re-Emerge?

G'day ladies and gentlemen! Today I'll be going through why dinosaurs didn't make a comeback. As some people think if they evolved once, why can't they again? Well there's different variables which are involved so sit back and lets get into it.

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Sources:
Could Evolution Ever Bring Back the Dinosaurs?

Song
Lakey Inspired - Better Days

#dinosaur #birds #evolution

[The_Cosmic_Yog-Sothoth]

Well, as you said, ostriches and emus have a very similar body plan to the Ornithomimid theropods of the Cretaceous. Just because they are more likely to eat plants does not make them less of a theropod.

[BBP-OMO]

Honestly I'd argue the biggest issue with dinosaurs comming back is just how specialised birds are. To even start getting something resembling a therapod, you need something like the Secretarybird, give it a reason to entirely give up flight, put it in a position where it's the only large predator in it's enviorment and then give it natures most powerful roids and an ecosystem full of mega fauna. Even after all that the bird would need to evolve something resembling a tail again just to grow past the size of a polar bear or so, that's still assuming a predatory animal of that size with a beak could work when it comes to anything around it's own size or bigger.

[Tarbtano]

It's worth noting there were Terror birds that ranged into North America and apparently did quite well for themselves. The type of Smilodon that coexisted with the last of the large Terror birds was only about the size of a leopard and did not occupy the same niche. Instead there was a minor extinction event about 2 million years ago that seems to have done the birds in with not much input from the mammals (add several large predatory mammals also went extinct at the same time).

[Crakinator]

Birds aren’t just related to dinosaurs, birds ARE dinosaurs. They’re the only theropods adaptable enough and, crucially, small enough to survive the K-Pg catastrophe.

[billchadwell]

I view dinosaurs the same way i view mammals. If all mammals died out tomorrow except for bats then mammals didnt go extinct they just lost most of their genetic and ecological niche diversity. Birds are dinosaurs the same way bats are mammals. Just because they fly doesnt magically make them go into a different category.

[patrick_j_lee]

6:12 It sems now that the Terror birds weren't out competed by the saber toothed cats. The last giant terror bird, Titanis, actually kept them in check, keeping Smilodon gracilis small. It was only once Titanis went extinct that truly large Smilodon populator evolved.

[jessejarmon]

I'm disappointed you didn't mention the Bathornithidae, a family of flightless predatory birds that were closely related to Terror Birds that thrived for millions of years in North America from as far back as the Eocene all the way to the Miocene. The Bathornithids never get any love.

[Spongebrain]

I always think back to the ending of Walking With Dinosaurs where it feels pretty sad when the dinosaurs went extinct but the narrator assures the audience they are not really gone and live on via the birds. And with that Im glad that birds are the way they are and there's no reason for them to go back into looking like their ancestors

[GODEYE]

I’ve always wondered how long after impact did it take for every Dino to die out. Like a couple of years or a couple thousand years? Is it possible small pockets or herds survived for a while

[Goji-C]

As much as I love the powerscaling stuff, as a former dinosaur kid these informative videos about questions I have had since I was a kid are bangers 🔥

[X]

It's interesting to note that there are time periods in which one type of Class is most dominant. We had micro-organisms first dominate, then sea creatures, then plants, then insects, then dinosaurs, and now mammals.

[panzerschiffe]

As an Australian myself, I can say this man truly lives down under. I have seen a few of the places photographed in the images so that's pretty authentic.

[waytoomuchtimeonmyhands]

The same change that allowed birds to survive the KT extinction is what largely kept them from regaining super-megafauna status. They have a slight build, hollow bones specialized for flight, not for combat with more robust mammals. I could see reptiles like monitor lizards or crocodilians evolving to become like non-avian dinosaurs but only if mammals suffer some catastrophe. Maybe something comes after mammals, like whales returning to land or supersizing rodents, that shake things up.

[beastmaster]

The main obstacle in the way of birds re-evolving into dinosaurs is a lack of a boney tail.

Without it, they won’t get any bigger than some of the largest birds in Earth’s history (moas, elephant birds, terror birds, etc.)

Which, while large in their own right, are dwarfed by their larger, more ancient kin.

[saurongor]

A lot of people do not know that terror bird had arms with two fingers and claws on each hand

[alexbowman]

It’s possible that we finally finished off the dinosaurs. When I say “we” I mean our ancient ancestors, small mouse like mammals who presumably survived by burrowing underground and living off whatever they could, roots, dead animals and eggs. Them stealing dinosaur eggs may have prevented an eventual comeback. Even today ground roosting bird populations on remote islands can be decimated by the arrival of ship borne rats.

[Eye_Exist]

the weirdest thing to me is that even though we don't know much about the small dinosaurs, the sole fact that the dinosaurs ruled the era means that there had to be dinosaurs the same size to the small mammals and birds, who according to the modern theories survived the extinction event because they were so small and thus could hide better from the immediate destruction and adapt better to the sudden change of environment. why didn't the small land dinosaurs survive, if birds and small mammals did? - to me this pretty much suggests that only the big dinosaurs died at the KT-extinction and the extinction of the smaller dinosaurs was much longer more gradual process, which just didn't leave much evidence because the smaller bones preserve worse and are much harder to find than the larger ones, which is why to us it seems like the entire era of dinosaurs ended at the KT-event.

[mythplatypuspwned]

The Seriema is kinda the closest we have right now to carnivorous theropods in a way, since they're the closest living relatives of the Terror Birds.

[Cat-tastrophee]

I just found your channel and like the way you present information clearly and logically, and there's a nice cadence to your voice as well. Newly subscribed! 🦖

[DanDaFreakinMan]

From my understanding: they tried. Some birds like the terror bird, elephant bird, and the cassowary evolved to become dinosaur-like to fullfill their former niche. Problem is by the time they got anywhere all the mammals have evolved to become the dominant predators, making competition more fierce for them to do anything they wanted.