Yes, it is plainly obvious that species change over time. As a matter of fact Darwin’s theory was based on the premise that species change – I guess that is why it is referred to as Darwin’s ‘evolutionary theory’. People who disagree with Darwin seldom contest the fact that species evolve – only what he proposed was the driver of change; (i.e. natural selection).
To somehow suggest the peacock is stable is to diverge from Darwin’s claim that species evolve – and about the only claim he made that was correct.