Which dinosaurs? Predators usually had relatively large heads because big head > big jaw > kill better and bite off more meat. But herbivores usually did not, as they could just focus on plants (instead they could develop longer necks to reach them in various places); some species such as Stegosaurus had rather famously tiny heads.
Tiny arms are associated with Tyrannosaurus and similar large theropods, but lots of other dinosaurs had relatively large arms, such as Dromaeosauridae (“raptors”). Their arm size probably reflected how much they were used during hunting - raptors’ much more so than T-rex’s, the latter probably relied on its jaws primarily. Of course discussing “arms” of various gigantic four-legged sauropods is pointless…
Basically there’s too much variety among dinosaurs to answer your question directly.
Which dinosaurs? Predators usually had relatively large heads because big head > big jaw > kill better and bite off more meat. But herbivores usually did not, as they could just focus on plants (instead they could develop longer necks to reach them in various places); some species such as Stegosaurus had rather famously tiny heads.
Tiny arms are associated with Tyrannosaurus and similar large theropods, but lots of other dinosaurs had relatively large arms, such as Dromaeosauridae (“raptors”). Their arm size probably reflected how much they were used during hunting - raptors’ much more so than T-rex’s, the latter probably relied on its jaws primarily. Of course discussing “arms” of various gigantic four-legged sauropods is pointless…
Basically there’s too much variety among dinosaurs to answer your question directly.
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i think its quite obvious they’re talking about large theropods like Tyrannosaurus