The desert's most sophisticated aerial pack hunters

Nature · Published 26 October 2026 Swipe more like this →

In short: Most raptors are solitary predators, but Harris's hawks break every rule of avian behavior. In the Sonoran Desert, these birds coordinate with a level of sophistication that mirrors wolf packs, using complex group tactics to take down prey twice their own size.

While many birds of prey hunt alone, Harris's hawks are notable for their communal hunting strategies. In the Sonoran Desert—North America's wettest desert—these raptors have evolved a highly coordinated approach to survival. Research by avian ecologist James Bednarz in the 1980s confirmed that these hawks often live and hunt in groups, most frequently consisting of about five individuals. This unique environment features lush green forests adjacent to baked earth. The hawks navigate a landscape home to Gila monsters and tiny elf owls.

The coordination begins with what Bednarz calls an 'assembly ceremony' at daybreak. The group gathers on a single perch, such as a cactus or utility pole, before splitting into two teams. These teams methodically leap-frog one another across the landscape, flying up to 200 meters to new lookout points. They maintain constant visual contact, scanning for prey while ensuring they are not caught off guard. Bednarz spent hundreds of hours observing these birds from the bed of a pickup truck. He utilized radio transmitters on about 40 hawks to track their movements in New Mexico.

When a target is spotted, the hawks signal each other through specific body language, such as bobbing their heads or moving horizontally. They then converge using tactics like the 'surprise pounce,' where the group attacks from multiple angles simultaneously. This ensures that even if one hawk misses, others can strike from different directions to secure the kill. These tactics allow them to overcome animals that are twice their own size. The coordinated strike is so effective it surprised researchers who first documented it.

This behavior is considered some of the most sophisticated cooperation documented in the avian world. While other raptors like Aplomado Falcons or Golden Eagles may hunt in pairs, they do not match the complex, multi-group coordination seen in Harris's hawks. Peregrine Falcons and Golden Eagles also exhibit some level of cooperative hunting in pairs.

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