you are trying for the effect that you are, I can understand the title; however, I was troubled by the "black scars", I feel that it [tries too hard]. I have yet to see black scars on white skin. I totally agree with the rest of the quatrain and had no trouble digesting that. In looking at the animal kingdom, I'm afraid that you have no help there. There are few and far between instances where animals of different species get along that well. We are all made of the same materials, chemicals and atoms, yet we are in constant competition with one and another. Being that we are supposedly the most intelligent of all the species on earth, we should understand that it is to our advantage to co-operate and thrive. But...

Geezer.
.

Do you think you would want one more quatrain that finishes the poem? That would make the poem sort of "even" with four stanzas of four lines each.

To add to what Gee said, but go in a different direction: there are tons of forms of symbiosis in the natural world that mutually benefit both living creatures. One of my favorite pairs are the birds that clean the teeth of alligators and crocodiles. The birds get to eat whatever leftovers the alligator or crocodile was munching on and the alligator or crocodile gets clean teeth. The alligator or crocodile doesn't eat the bird because it doesn't want rotten teeth. I also love the small fish that swim with manatees and eat the algae and barnacles off the manatee. The manatees don't have to scratch their backs on a boat and get hurt by the boat, and the fish get a meal.

Within the same species (since humans of different colors are still the same species), most types of animals get along with their own species. It is usually only predator and prey that can't get along in most cases.

Anyway, as for the poem, what do you think of something like this:

Our superficial distinctions
have caused a great divide
if only we could learn acceptance
our true selves wouldn't have to hide

or this:

differences in skin
shouldn't ever fuel hate
we must start teaching our children
before it is too late

I'm not very good at rhyming poetry, but I hope these two sample stanzas that describe your end goal will give you some ideas for where to go with the poem.

Take care,
Kelsey

PS: I find the title captivating and I appreciate that!