What did the T-Rex (a type of prehistoric dragon) use its little arms for?

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I always thought they were for riding sandworms because that's fucking badass but youtube has been insistent on showing me videos on this subject lately for some fucking reason and APPARENTLY there are numerous far gayer theories
 
I haven't been watching the videos thoroughly but my favourite serious theory I've heard is that they used them for cow tipping.
Like a t-rex would just fucking walk up to a stegosaurus or whatever and push it over

I also read that the arms were just on their way out. South America was full of giant flightless birds with tiny vestigial wings during the Cenozoic. South America had dinosaurs with similar tiny arms. Carnotaurus looked like a thalidomide baby. South America has a fossil record full of weird dinosaurs and giant carnivorous flightless birds known as Terror Birds.

The extinct moa bird of New Zealand actually had no wings at all.

When you don't fly and get by on powerful legs your wings are going to start selecting smaller and smaller and possibly disappearing altogether unless you have some other use for them like balance or display.
 
They're only there for comic effect. Imagine one running, and how those little arms were pumping with that big T-Rex sharp toothed head. Evolution is mean, sometimes.

They didn't even get to be birds.
 
I also read that the arms were just on their way out.
Eh I dunno. They were relatively quite muscular and there's fossils with particular stress damage to the bones which suggest they were using them for something forceful, we just don't know what.
There's also the weird two-fingered adaptation they and their close relatives have: it's not like they were normal three-fingered theropod arms that were just vestigially shrinking away--they for some reason adapted to have two fully-developed claws.
Again I was only kinda half paying attention but apparently there's some guy who thinks this might have been to more effectively concentrate force if they were used to shiv niggas, while other scientists say no that's dumb because of the wrist angles or something.

Also FYI I don't think the cow tipping hypothesis has much support, also because of wrist bones for some reason. But that aside apparently the maths does work mechanically for them to be able to tackle common dumb idiot herbivores down, and they also have notably oversized feet for a theropod so they'd have a lot of ground purchase for judo shit, potentially.
 
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