TIL about de la Chapelle syndrome where people with XX chromosomes are born with traditionally masculine organs & presentation. Usually those with the trait are unaware they have XX chromosomes at all
That would be the laryngeal nerve. It’s been with us vertebrates for a long time.
I take your, “for zero reason,” to indicate that it’s silly that it’s so long in a giraffe. And it is, because it connects the larynx and the brain, two bits that aren’t very far apart. You’d never design it that way from scratch.
But the laryngeal nerve’s length has a reason: it loops around the heart and it developed in our fish-like ancestors. At that time, it wasn’t silly for the nerve to wrap around the heart, because fish don’t have necks and thus the nerve was about the same length whether it wrapped around the heart or not. As necks developed, evolution found it easier to lengthen the nerve than to reroute it. So here we and giraffes both exist, having much longer laryngeal nerves than you’d engineer if you were making us from scratch.
Yeah, as I commented elsewhere, I'm damn impressed my code managed to compile and run. I guess life has a pretty fault-tolerant compiler at times, or maybe I was just super lucky to not have the errors be in spots that'd completely screw me over.