Emergent synchrony is a universal feature of behavior.
Marvellous murmurations: why do birds flock together?
Like birds of a feather, sperm flock together
What can flocking blackbirds in the winter teach us?, UNC Charlotte Urban Institute
The Teamwork of Late Winter: Bird Flocks
Scientific birds of a feather flock together: science communication on social media rarely happens across or beyond disciplinary boundaries
Why do birds huddle on power lines?
Why do birds flock together in winter?
How a Flock of 400 Flying Birds Manages to Turn in Just Half a Second, Smart News
The Basics of Bird Migration: How, Why, and Where