We Are Ultimately The Same

What is the difference? There is none.
BUT
If we kill an animal, that's fine
If we kill a human, that's a crime

however
What is the difference? Can someone tell me? Because i don't see any difference. Some may lay eggs, but it's still reproducing isn't it.

We all have lives
We can all feel
We all have family and are protective of them
We have kids
We have enemies
We have hearts
We have brains
We can see
We can think
We have bodies

So tell me, what's the difference?