No, and this is probably the most persistent myth in casual bird conversation. The idea that there is "the only bird that will attack an eagle" is not supported by documented behavior. Multiple bird species, particularly other raptors, regularly attack, mob, or harass eagles in the wild. The real picture is messier and more interesting than a single nemesis species.
Cornell Lab's Birds of the World puts it plainly: "Many other species also may attack eagles." That phrasing is significant. It is not a rare exception, and it is certainly not limited to one bird. If you have heard the claim that only one species dares to attack an eagle, that claim is folklore, not ornithology.
The attackers that show up most consistently in the literature are other raptors. Red-tailed Hawks are probably the most documented aggressors. Birds of the World specifically notes that both Golden Eagles and Bald Eagles are "regularly harassed, chased, and attacked, especially near Red-tail nests." That last phrase matters: location relative to a nest is a major driver of these interactions.
The USFWS lists several raptor species known for aggressive behavior toward other large birds during nesting season: Red-tailed Hawks, Red-shouldered Hawks, Cooper's Hawks, Swainson's Hawks, Northern Goshawks, Broad-winged Hawks, and Peregrine Falcons. Any of these can and do go after eagles when circumstances call for it. The Peregrine Falcon in particular is fast and fearless enough to land real strikes on a much larger bird.
Corvids, especially Common Ravens and American Crows, also mob eagles frequently. They rarely injure eagles, but they are persistent and can disrupt feeding, rest, and nesting. The Raptor Resource Project documents "intrusions" near bald eagle nests by a range of species, with Red-tailed Hawks specifically called out as a common intruder in or around eagle nesting areas.
It is also worth knowing that eagles attack each other. Intraspecific aggression (same-species conflict) over nest sites and territory is well-documented and can be more dangerous to an eagle than anything a smaller bird does. When thinking about what bird attacks other birds in a territorial context, eagles themselves are on both sides of that equation.
The window roughly runs from January through August, though it varies by region and species. During this period, raptors are defending eggs and chicks and are highly motivated to drive off anything that comes close, including an eagle that wanders into the wrong airspace. USFWS guidance specifically flags this season as the period when aggressive raptor behavior spikes significantly.
Outside of nesting season, attacks are more likely to be about food. Eagles are kleptoparasites, meaning they steal prey from other birds, so a Red-tailed Hawk that just caught a rabbit has a real reason to drive off an eagle that is eyeing that meal. This kind of pursuit is common and can look dramatic, but it is typically short and does not result in injury to either bird.
Young eagles, especially those in their first and second years, lack the flight experience and social signals of adults. They are more likely to drift into occupied territories by accident and less capable of reading the warning signals other raptors send before escalating to a physical attack. If you observe an attack, the target is more likely to be an immature bird than a full adult.
These three things look very different once you know what to watch for. Getting this right matters if you are trying to report what you saw or understand what actually happened.
| Behavior type | What it looks like | Likely outcome for the eagle |
|---|---|---|
| Harassment / mobbing | Smaller bird dives repeatedly at the eagle, calling loudly; eagle keeps flying or eventually leaves the area | No injury; eagle moves on |
| Predation attempt | Sustained pursuit, physical contact, targeting of vulnerable body parts; often aimed at nestlings or injured birds | Possible injury or death, especially for nestlings |
| Kleptoparasitism | Eagle chased immediately after catching prey; attacker breaks off once eagle drops or escapes with the food | Eagle loses a meal, no injury |
| Scavenging | Smaller bird feeds on an eagle carcass already on the ground; no pursuit or aggression involved | Eagle was already dead before the bird arrived |
Scavenging is the one most people misread. Finding a crow or raven feeding on a dead eagle does not mean that bird killed the eagle. Ravens and crows are opportunistic feeders. Unless you witnessed the actual attack and death, do not assume the bird eating the carcass is the culprit.
The behaviors above overlap somewhat with the reasons what bird attacks humans gets asked so often. People often see dramatic aerial conflict and assume the worst, when most of it is territorial signaling that stops well short of serious injury.
If you are watching raptors near a pigeon colony or a mixed bird area and wondering how to interpret the behavior you are seeing, it helps to understand that the same territorial logic applies across species. The question of what bird attacks pigeons follows similar patterns: raptors attack when they are hungry or feel threatened, not because of any single fixed grudge.
This is the core myth this article exists to correct. It is false. At minimum, Red-tailed Hawks, Peregrine Falcons, Northern Goshawks, Red-shouldered Hawks, Cooper's Hawks, Broad-winged Hawks, Swainson's Hawks, Common Ravens, and American Crows are all documented as birds that attack or harass eagles. The "only one" framing probably comes from the dramatic nature of certain encounters being shared on social media or passed through informal wildlife conversation, but it does not reflect the science.
Size and power do not guarantee victory in a surprise attack, especially for a young or injured eagle. A Peregrine Falcon, the fastest animal on Earth in a dive, can strike a large raptor before it has time to react. Persistent mobbing by corvids can exhaust a bird or drive it from critical territory. Eagles are apex predators in many ecosystems, but they are not invincible.
Most diving and chasing behavior is harassment designed to move the eagle out of an area, not kill it. The goal is displacement, not predation. The same principle applies when you look at why would a bird attack a human: the motivation is almost always "get this threat to leave" rather than genuine predatory intent. Understanding that distinction changes how you interpret what you are watching.
Large raptors mob each other constantly. This is thoroughly documented. A Red-tailed Hawk is a large, powerful bird in its own right, and it regularly drives off Bald Eagles many times its mass. Mobbing is not a small-bird strategy; it is a widespread behavioral tool used across the raptor family.
They are not. Both the timing (nesting season) and the location (near nest sites) are highly predictable. If you understand those two variables, you can anticipate where and when you are most likely to witness or be peripherally involved in raptor conflict. This predictability is also why why bird attack human questions peak during the same January-to-August nesting window: the same nesting-season aggression that drives raptors to attack eagles also makes them more likely to act defensively toward people who get too close.
If you are near an eagle nest and witness a raptor attack, your own safety is a real consideration. Any large, agitated raptor, eagle or attacker, may redirect aggression toward a person who is perceived as too close. Talons from a hawk or eagle can cause real injury. There is a reason wildlife agencies use the language "do not approach" so consistently. If you are curious about how far this kind of redirected aggression can go, the documented cases of which bird attack human eye are a useful reminder that birds of prey aim for the face and eyes when they do make contact with people.
The broader pattern is similar, other raptors and corvids may harass both, but specific repeat intruders can vary by region and which species is nesting nearby. If you are identifying what bird attacks eagles in your area, focus on the raptor species you already see around the same cliff, river corridor, or tree line, because that local “nest neighborhood” drives who shows up.
Look for the objective. Harassment usually shows repeated passes and chases that push the eagle away from a boundary, with lots of changing directions and less sustained contact. A predation attempt is more likely to involve a single focused attack, quicker escalation to grappling, and a clear chase after the target drops or becomes unable to flee.
Serious injury is uncommon, but “rare” is not “never.” Corvids can deliver damaging pecks and can interfere enough to cause an eagle to abandon a nest or miss feeding opportunities. If a corvid attack appears targeted at an eagle’s head or a nestling, treat it as potentially risky and avoid lingering nearby.
Not necessarily. Corvids frequently feed on carrion, so the bird at the carcass may be the scavenger, not the cause of death. The deciding clue is whether you witnessed an earlier capture attempt or prolonged predation, carcass condition, and whether the eagle died near active nesting defense versus an unrelated hunting or accident site.
Nesting season (roughly January through August, depending on location) is the peak for defense, especially near eggs and chicks. Outside that period, encounters are often tied to food, theft risk, or territorial disputes around perches and hunting grounds, so you may see more brief chases rather than sustained nest protection.
Yes, immature eagles are more likely to drift into other birds’ territories and are less consistent at interpreting warning displays. In the field, you can sometimes recognize immatures by less distinct adult plumage and by different flight behavior, such as less confident straight-line travel or more hesitation near boundaries.
Do not approach. Even if you think you are watching from a safe angle, a large raptor can redirect aggression toward people who enter its perceived risk zone. As a practical rule, increase distance rather than trying to “get a better look,” and move away slowly, because sudden movement can trigger a closer pursuit.
Yes. Eagles are aggressive toward conspecifics over territory, and they also harass or steal from other birds, which can create situations where an observer interprets the sequence backwards. If you want to know what bird attacks eagles, note who initiated the interaction and whether the eagle was defending a nest area or attempting food acquisition.
Because the end goal is often displacement, not injury. Many strikes and dives are part of signaling and boundary enforcement, especially during the breeding season. When the pursuer stops after the eagle changes location, that shift strongly suggests territorial harassment rather than an extended predation attempt.
Assuming a single species is responsible based on one dramatic clip. Another frequent error is ignoring timing and location, since nesting proximity changes behavior. If you are reporting, include the date or month, whether you were near a nest, and what the target was doing (feeding, flying through, landing, or guarding).
Other raptors are the most consistent category, particularly red-tailed hawks, along with several additional hawk species and peregrine falcons in many regions. Corvids, especially American crows and common ravens, are also frequent participants in mobbing and harassment. If you tell me your region and habitat type, you can narrow it further.
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