Almost 5 years old, but still worth sharing: the first ever video of mating anglerfish.

Most of what we know about deep-sea anglerfish comes from dead animals pulled up in nets. Scientists have identified more than 160 species, but only a handful of videos exist—and this is the first to show a sexually united pair. “So you can see how rare and important this discovery is,” Pietsch says. “It was really a shocker for me.”

Isn’t nature just swell?