Quick ecology quiz for y'all. Can a species evolve to fill a niche that another species already occupies? Don't even think, just answer intuitively. Off the top of your head (if that's the expression)
A lot of outcompetition hypotheses, especially those concerning Cenozoic animals. Not only are most of them unconfirmed or worse yet unfeasible, but they easily give the impression that our modern fauna is “superior”.