I wrote a thread once about Theropods having like anatomy with birds as possibly just a convergence of bone type with physics. So birds did not evolve from dinosaur types like theropods.
I have watched recently youtube docs on T-rex and theropods etc and how they are claimed to be birds.
Once again its ac classification error. First there was no dinosaurs. tHey are just KINDS with some trivial like traits. just as mammals or reptiles are just KINDS of creatures with like traits. no relationship otherwise from a creator ir from evolutionary lineage.
It occured to me as another option that these theropods and T-rex could be simply ground birds.
there was later, post flood or above the k-pg line, 6 and 9 foot moas and elephant birds on islans like New Zealand and madasgaschar, and South America, and elsewhere.
They also were meat eaters, sometimes, and could not fly or even had wings/yet flourished in great sizes.
I think its a very viable option that many KINDS of dinos who have very bird like anatomy were in fact just ground birds. So T-rex, despite its great head/teeth, was possibly just a ground bird that did not roar. I saw a Youtube doc by a Dino guy, who advised the Jurassic park movies, who argues T-Rex etc head shape changed greatly as they grew older.
I suggest its very likely true that some ‘dino” types like the bird bone ones were just birds. Not reptiles. Just adapted to a rough post fall world. Just that simple. Possible also for others to have like anatomy for like needs but I’m leaning towards like anatomy means the same thing.
So the evolution of birds from dinos is not true and based on a classification system more then observation and other options of anatomy origins.