Three crows on a Red-tail for ten minutes. The hawk left. They didn't.
Crows attack hawks for one main reason: hawks eat young crows. By harassing a perched or flying hawk - “mobbing” - crows drive the predator out of their nesting territory before it can strike. The behaviour also teaches younger crows which species to fear and recruits other crows to the defence. Most mobbing is loud, persistent, and surprisingly safe; serious injury to either bird is rare.
What mobbing actually looks like
A typical mobbing sequence:
- First alarm - a crow spots a hawk and gives the distinctive harsh “kaw kaw kaw” alarm call, faster and louder than its normal contact call.
- Recruitment - within 30-60 seconds, other crows in earshot arrive. Three to fifteen birds usually gather.
- Aerial harassment - the crows take turns diving at the hawk, often coming within a few feet but rarely striking.
- Forced departure - the hawk eventually moves on, often visibly annoyed. The crows escort it for hundreds of metres beyond the territory.
- Stand-down - alarm calls stop, the flock disperses.
The whole event usually lasts 5-20 minutes. Crows can mob the same hawk multiple times in a day if it lingers nearby.
Which hawks get mobbed
Almost all - but not all to the same intensity:
- Red-tailed Hawk - the most commonly mobbed species, big and visible.
- Cooper’s Hawk - more dangerous to crow nestlings, gets aggressive mobbing.
- Sharp-shinned Hawk - similar to Cooper’s.
- Great Horned Owl - heavily mobbed if found roosting in daylight (owls kill more adult crows than any hawk).
- Bald Eagle - opportunistically mobbed though usually too large to drive off quickly.
- Northern Harrier - mobbed at the edge of fields.
Buzzards and turkey vultures get less attention because they aren’t predators of crow nestlings. Falcons get mobbed but are usually too fast to be effectively harassed.
Why mobbing works (and why it's relatively safe)
Three reasons crows can attack hawks without getting eaten:
- Numerical advantage - a hawk can defend itself from one attacker but can’t track five.
- Maneuverability - crows are smaller, more agile, and out-turn most raptors at low speed.
- No commitment to land - the crows don’t actually need to physically touch the hawk. Forcing it to keep moving disrupts its ability to hunt.
Hawks rarely engage seriously because the energetic cost of trying to catch a crow in flight is high and the success rate is low. Easier to leave.
The teaching role
Young crows that don’t yet know which species are dangerous learn by watching adults mob them. Studies on captive crows show that birds remember individual humans who threatened them for years, and crow-to-crow social learning is well-documented. A juvenile crow that’s seen the family mob a Cooper’s Hawk three times will recognise that species for life.
This is also why crows sometimes mob harmless species (cats, dogs, herons) - juveniles still working out the threat list.
Nikon Prostaff P3 8x42
Catch the species ID at distance.
Mobbing events tell you which raptor is in your area without you having to find it yourself. The crows do the work. Good binoculars let you confirm the species (Red-tail vs Cooper's vs Goshawk) when you hear the alarm calls and scan the sky.
- 8x magnification, 42mm objective
- Wide field of view for aerial action
- Waterproof and fog-proof
Nikon · Prostaff P3
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The bottom line
Crows attack hawks to drive them out of nesting territory, protect young crows, and teach juveniles which species to fear. Mobbing relies on numbers and agility, not physical contact. Most events last 5-20 minutes and end with the hawk leaving. Watch the sky when you hear alarm calls - the crows will find the raptor for you.
For more, see do hawks attack pets and can eagles kill humans.
