Saying we are 100% human does not mean we are 100% the same.
The most difficult part about even suggesting such a thing is which ethnic group gets to be the focus?
Well, all the fossil records say we originated in Africa, so I guess Africans are the focus.
30,000 years ago there were very large animals on every single continent. Mammoths, Saber tooth tigers, giant sloths, HUGE reptiles in Australia. And then they all died mysteriously. Happened to coincide with human dispertion across the globe. Does that imply that we killed them? That's a huge debate. But most people admit, that most likely we did do it.
But let me ask you this:
If humans killed all the large animals on all the different continents, why is Africa, our ancestral homeland, the only continent that is known to have very large animals?
Because those are the only animals that coevolved with us.
Those are the only animals that slowly adapted to our increasing abilities to kill them.
If a herd of Antelope in Africa see a lion come over a hill they do not run.
They just look at it and mutter, "I see you, lion. You start running and I'm out of here."
Those same Antelope see a human come over a hill and they run like hell was behind them.
One says, "Hey, is that a human?"
"Ah, crap yeah it is! Freaking RUN!!!!"
When we traveled out of Africa all the large animals did not realize how dangerous we were.
They just looked at us and said, "That's a funny looking animal. Never seen anything like that. Hey, why is it holding that funny branch thing? What is it doing with that? Really odd animal. Hey wha??? gurgle..."
Any animal in Africa would have told them. Don't wait. Don't just stand there. Just run. Run like the wind.
If humans and animals were all created at the same time, and no one had a chance to evolve in response to the dangers of each other, then all the surviving large animals would not only exist in Africa.
But they do. So what does that tell you?