The skin of our backs descends into a v, like a bird's wing does to its body-a bone hinge covered in smooth skin, our spines locked together at the base.

The team found that two of the wing bones showed evidence of combat, including a fractured hand bone and a centimeter-thick upper arm bone that was broken in half.

The skin of our backs descends into a V, like a bird's wing does to its body—a bone hinge covered in smooth skin, our spines locked together at the base.