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Like what do you mean you didn’t know that dinosaurs as we know them (non avian dinosaurs) never fully went extinct? I mean obviously the bigger animals of the late Cretaceous went extinct after the KT mass extinction event, for example the T.rex, the Triceratops, all of the sauropods, ect. But where do you think the birds came from? They very clearly evolved from smaller non avian dinosaurs more closely related (both taxonomically and by appearance) to birds like I mean if you just look at some birds of prey it’s super obvious

(above is a real image of a bearded vulture, or a Gypaetus barbatus, I unfortunately cannot find who took this picture)

(And above are 2 depictions of a velociraptor, neither source listed the artists that made this drawing/3d model)

it’s very clear the similarity between the 2, but appearance doesn’t prove anything, really we should look at the differences in the wings. A maniraptorian hand shows 3 fingers that later fused to be more like 2 fingers when seeing something like a chicken or dove wing

Ive loved dinosaurs since I was 4 and only recently starting researching/studying them (2 years) any dinosaur nerd could explain this better than me but I can keep trying as I do want people to know this.

I’m gonna try describing how non avian dinosaurs evolved to be avian, to the furthest of my knowledge at least.

the KT extinction happens, obviously sending a ~7 mile asteroid towards the earth, and the earth goes into an apocalypse type climate, having the surface of the earth be scorching and almost instantly killing almost all plant life. About only seeds, grain, small insects, and the very few remaining dinosaurs were left from this.(wow this sounds a whole lot like most avian diets today huh?)

because the plants died out, ~ all of the herbivores died, because all the herbivores died, all the big carnivores died, because all the big carnivores died, literally everything else is thriving. (not exactly thriving, but surviving ig) while eating seeds and small insects to stay alive, the small carnivores and the birds that have already evolved by that point became even more bird like by evolving more developed beaks to replace teeth, loosing their hand claws as they had no use for them anymore, and losing their bony tails. Therefore evolving into birds that today still have the same diet