Birds have a number of loud and showy ways to attach a mate. But they also have a subtle one: smell.
And it turns out that some of that smell are naturally made by bacteria in the preening gland.
So I’m not saying you should use “hey girl, you smell like the best bacteria” as a pick up line, but it might be worth trying!
(If you’re a bird. NiB is not responsible for this interaction going south)