Divas of the avian world, elaborately feathered birds of paradise, like this ribbon-tailed species, practice elaborate courtship rituals.
The need to identify a suitable mate is such a strong biological urge that the animal kingdom has spawned a bewildering array of courtship rituals.
Our courtship rituals are rapidly changing, and we don't know what to do.
Adelie penguins, for instance, employ yawning as part of their courtship ritual.