Least sandpipers (Calidris minutilla) are the smallest of the five small sandpipers known as "peeps." I haven't seen any in Central Park, but I did see three exploring the west rocks at Governors Island on August 6, 2017, and a pair at Muscota Marsh on Aug. 13, 2015. I have seen them on Nickerson Beach on Long Island, and at the Lido Beach Passive Nature Area nearby, in 2023.
Least sandpiper, Lido Beach Passive Nature Area, Long Island, July 13, 2023
Least sandpiper, Governors Island, Aug. 6, 2017
Least sandpiper, Governors Island, Aug. 6, 2017
Least sandpipers, Muscota Marsh, Aug. 13, 2015
The Filming the Feathers video, short but I hope sweet, features music by Carl Heinrich Carsten Reinecke, Octet, Op. 216, performed by the Soni Ventorum Wind Quintet.
