2-minute read

Whirring, thrumming waves and swirls. Pulsing, whooshing twists and twirls.

Murmurations, the mesmerizing sound shapes of hundreds to hundreds of thousands of common starlings, are one of the most spectacular displays of collective animal movement in nature. How and why these feathery shapeshifters gather to perform their synchronized aerial maneuvers has long captured the imagination of both scientists and curious casual observers of evening skies.

From late fall to early spring, these birds of a feather flock together at dusk in continuously morphing configurations before descending in one fell swoop to roost. Are the massive gatherings a safety-in-numbers strategy to confuse predators or a signal to attract more birds to create warmer roosts?

To determine what drives the ebb and flow of these spontaneous avian zoomies, scientists analyzed videos of starlings flying in formation and reconstructed the movements of individual birds, looking for patterns in behavior. The analysis revealed that starlings navigating in a murmuration at up to 20 m.p.h. have an amazing ability to rapidly maneuver in sync with fellow fliers, reacting to changes in direction in under 100 milliseconds. Each bird follows the behavior of the six or seven closest neighbors, and the wave of perpetual movement ripples through the flock forming fluttering sound shapes in the evening sky.

Researchers studying details of over 3,000 murmurations gathered by citizen scientists across 23 European countries believe that starlings form giant catch me if you can bird clouds and descend en masse to roosting sites to avoid being singled out and picked off by aerial predators.

Interestingly, the dynamic rotating shapes formed by the safer together survival strategy seem to follow patterns of collective motion found in other groups of animals, including wildebeests, fish, and ants.

Whirring, thrumming waves and swirls. Pulsing, whooshing twists and twirls. The hypnotizing movements of a gathering of birds at dusk—a reminder of nature’s eternal rhythms.

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