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.

  Least sandpiper, Governors Island, Aug. 6, 2017

Least sandpiper, Governors Island, Aug. 6, 2017

  Least sandpiper, Governors Island, Aug. 6, 2017

Least sandpiper, Governors Island, Aug. 6, 2017

  Least sandpipers, Muscota Marsh, Aug. 13, 2015

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.