If they haven’t changed for millions of years, that would indicate an ending point, wouldn’t it? If evolution were real, there would be no separation of species, as every individual would evolve differently. While everyone is different, there are no branches of humans that have naturally evolved with special characteristics that are completely unlike the rest of us.
Who said they haven’t changed in millions of years. They may be similar, but we see a lot of speciation within all the groups that you describe. There may have been birds (for example) millions of years ago, but we are seeing countless more variants evolved now than we are aware of that existed millions of years ago.