My photos are not very good -- they are taken with an iPhone X. But click on the image to enlarge it. It is blurry, but it shows the field marks for this species OK.

Note the the yellowish-greenish body, the slightly orange bill, and the two wing bars visible on the shoulder.

The Cornell Lab says, "Females are yellowish overall with a gray back and darker wings marked by 2 wingbars.

This female has been in this park since December, and recently she has been coming to this feeder every day in the morning and/or at lunch time.

And I myself have been coming to Carl Schurz Park every day for about a week to try to make an observation of her. I have seen her very briefly three times already, but this is the first time I have been able to get photos.

She was also here about 40 minutes before this, but just for two seconds. She does not stick around! Generally she flies in for a second or two, and then flies away again, sometimes without even visiting the feeder. I was super lucky to be able to get these shots, even though they are not very good.

A major discovery for me; with no reports of live specimens since 2007 - I was able to locate a population living at 1680 masl. The species appears to be fossorial, therefore extremely hard to spot. Unfortunately the location is a small relict of privately-owned cloud forest, surrounded by cattle fields.

Last time I was here (which was my first visit to this locality on November 8th 2020) I found a valve of this species, which is not known to occur on the East Coast at all:

https://www.inaturalist.org/observations/64517493

So, were both of the valves the remains of someone's lunch or dinner, or did someone introduce live Japanese Littleneck Clams to this bay?

I looked it up, and if I wanted to, I could order delivery of a pound of live Japanese Littleneck Clams for $8. I suppose they are from California, or maybe from Asia?

But I guess anything is possible when you can buy live clams like this.