- Migration: Hawks often travels in large groups, known as kettles, during migration to conserve energy and navigate more effectively.
- Hunting: Hawks may gather in flocks cooperative hunt, sharing information about preys location.
- Roosting: Hawks sometimes roost together in large communal roosts for safety and warmth during the night.
- Weather change: Changes in weather patterns can influence hawk behaviour. Some species may gather before a large weather change.
- Territorial behaviour: Hawks may gather to establish their territories and defend their nest sites during the breeding season.
- Mobbing behaviour: Smaller birds sometimes mob hawks, swooping and diving as a flock to defend their territories or distract predators from their nests.