Why Do Jackdaws Swarm?

Chaotic mobs of jackdaws suddenly get organised once enough birds join in, new research shows. The birds form mobs to drive away predators near their nests, and are initially disordered. ... The study also reveals that jackdaws follow different rules when mobbing predators than when flying to winter roosts.

Why do jackdaws flock?

Jackdaws partner up in their first spring as adult birds and stay faithful to each other all their lives. ... Before each night's rest the jackdaws gather together with their allies, the rooks, in large, loud flocks around churches or in high trees.

Why do jackdaws swarm at dusk?

At night, they are almost defenseless, so they gather in large flocks to roost in a spot where they have good visibility and reasonable shelter. Although crows congregate in rural areas, if there is a town nearby, they'll take advantage of it. Cities offer benefits.

James H. Sterling

James H. Sterling

Environmental Science & Climate Journalist

James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.