These birds flock in mesmerizing swarms of thousands—but why is still a mystery

When is "a flock of" used? - RedKiwi Language Guide

Top view of flamingo flock formation in dark water. High angle aerial shot of pink flamingos swimming and wading in deep blue lake water forming an arrow shape Stock Video Footage - Alamy

In 2019, a playful flock formation of 500 light elements filled the air of Theater Aan de Slinger in Houten, The Netherlands. The light sculpture, created by Studio Toer, is a continues line drawing that fills up the space, but the open structure doesn’t block the daylight that comes from the top windows. The Moooi suspension lamps Flock of Light 11 and Flock of Light 21 are derived from this art installation and are now available. https://moooi.to/FlockOfLight11 | Moooi