Finding another of your species in the vast midnight zone is no small feat, so when they do, diamond squid (Thysanoteuthis rhombus) often form lifelong monogamous pairs, even from a young age. Using scuba to drift in the open ocean at night, a technique known as blackwater diving, is one of the few ways humans can encounter deep-sea animals that migrate from the deep sea after dark. This showy juvenile was photographed flashing its chromatophores in the Gulf Stream off the southeast coast of Florida.