Nose Stud?

It's such a dull day today that it even needed flash to take a photo Tony (the peacock) outdoors at mid-day. Still, I like the way the flash has brought out his shades of green - including the green of his "adornment".

I assume he feels he's not flashy enough to attract his girl, so he's added this wee "garnish" to his beak to catch her eye.