The Spotted Sandpiper is widespread along the shores of lakes, ponds, and rivers. It also has the unusual characteristic of a sexual role reversal. The female is larger, sexually aggressive, and polyandrous — that is, it mates with multiple males, each of which is then left to incubate and brood (what it thinks are) its own chicks.
A year ago, I posted a picture, sandpiper piping, of a spotty that was calling and strutting. I didn’t know what was going on; now, I do. It was a female making an aggressive sexual display towards a nearby male. This last week, I watched this interaction repeatedly.
Having arrived at a dock, a female repeatedly harassed two males. They pretty much ignored her. Here, the female performs her courtship display on tiptoes with wings and tail outstretched.
Such a display is directed towards a particular male and accompanied by a weet-weet call.
“No, no, please don’t leave — weet-weet.”
Finally, the two males flew off. This is the female chasing after them.