>>723494715
Given what birds eat, it's fine. You don't really need to chew to eat a bug or small animal whole. For mammals, eating plant matter and other animals usually requires teeth to break down tendons and ligaments and plant matter to a digestible pulp, otherwise you end up having to spend more time and energy digesting the food than you would otherwise receive having chewed it.
>>723495250
>Rex was essentially a land Deinosuchus
Could also just call the T. Rex the dinosaur equivalent of a lion, to be honest. Even more so if they actually did hunt in packs. Same hunting method, different number of legs.