Further information after I left details the ANHINGA movements.
After the spot at mainland I relayed, the ANHINGA went back to Duck Island northwest section, a shift from it's north position earlier during the flash mob observation. Then it flew back to Three Sisters islands,landing on an eastern island tree. See a previous tweet photo post below by Meir.
If it sticks around tomorrow morning, focus on these two islands in the eastern lake sector. The Peninsula offers good vantage points. Of course it's up to the bird.
Finger crossed for Wednesday.