What makes magpies want to swoop? And is there any way of avoiding them?
U wot m8? Not even our Canberra Deep Space Communication Complex is safe

U wot m8? Not even our Canberra Deep Space Communication Complex is safe.

With warmer weather showing signs of returning across the country, so too are many of spring’s delights: the flowering of plants, greening of trees and rolling of cuffs all testament to the fact that the worst of winter is behind us.

Unfortunately, it’s not all lamingtons and Cherry Cheer at this time of year. For there is also a suburban menace lurking just over the horizon: a black and white marauder waiting to terrorise unsuspecting picnickers, exercisers and office workers alike.

Yep, September is magpie season


If this image doesn’t send a primordial chill down your spine, you’ve obviously never spent the month of September in suburban Australia. All around the country, roadsides, reserves and office blocks turn into battlegrounds as the Australian magpie looks to protect its patch from any and every threat it can lay its beak on.

So why do magpies swoop us humans – is it to defend their young, or their territory? Or are they just bird jerks?

Most importantly, is there any way we can guard against them?

There was an illuminating paper co-authored by academics from Deakin and Griffith universities, titled Attacks on humans by Australian Magpies (Cracticus tibicen): territoriality, brood-defence or testosterone? The paper, published in our Emu – Austral Ornithology journal back in 2010, looked to study three common hypotheses behind magpie-human attacks, particularly in suburban areas. Were the attacks triggered by territoriality, brood-defence or (magpie) testosterone, the authors asked?

The response of 10 pairs of aggressive magpies to natural levels of human intrusion was compared with that of 10 non-aggressive pairs. Behavioural observations strongly supported the contention that attacks on humans resemble brood-defence and did not support an association with territoriality. The study also found no support for the suggestion that testosterone levels correlated with aggressiveness towards humans: male testosterone peaked immediately before laying and was significantly lower during the maximum period of attacks directed at people. Moreover, there were no differences in the testosterone levels of aggressive and non-aggressive male magpies. The pattern of testosterone production over a breeding cycle closely resembled that of many other songbirds and appeared not to influence magpie attacks on humans.

So, brood-defence can be identified as the cause of attacks.

But, of more interest to posties, cyclists and small children with blonde hair in particular: what makes magpies more likely to attack some people, and not others?

Enter the brave scientists of CSIRO Black Mountain in Canberra. In 2010 (it must have been a bad year!) a particularly aggressive maggie was nesting on the foot and cycle path between the Australian National University and our Black Mountain site. With all types of magpie-repelling adornments being attached to cycle helmets with varied successes, and (figurative) public service and academia corpses littering the notorious path, our enterprising colleagues decided to add some scientific scrutiny to the debate: how do you deter a mad magpie?

The results can be seen in the following two YouTube clips that, in 2010 terms, broke the Internet.

We can’t really condone the results: we would never advise riding your bike without a helmet. But these videos also do quite clearly dispel the myth that helmet decorations do anything to stop a swooper.

And really, what’s better than seeing public servants being attacked by a magpie to the soundtrack of Tricky’s Maxinquaye?

Want to learn more about this quintessential Aussie which, September aside, we do actually really like? Then check out this great book available through CSIRO Publishing: Australian Magpie – biology and behaviour of an unusual songbird.

And remember, keep your eyes to the sky.


  1. Will the magpies living in my tree out the back that I feed everyday swoop me when the buns hatch

    1. Not likely. We do the same here and have never been swooped. They menace others in our street but not us šŸ™‚

    2. Not likely, as they don’t see you as a threat, but a food source. I do the same and have never had a local maggie swoop me come nesting season.

    3. Probably not. Ones we feed judt get more demanding for food as the babies grow. They are very sweet

  2. Our family has a theory about this that is supported by CSIRO’s findings.
    Magpies are clever animals and appear to have definite ideas about who/what is a ‘friend’. Fast-moving objects adorned with strange spiked helmets are definitely not friends. On the other hand, if you are walking near magpies, take the trouble to ‘sing’ to them or talk in a sing-song voice while looking at them (especially the scouts, who send out the warning calls to the fighter pilots). If you look at a magpie and say ‘hello maggie’ in the manner you would adopt with a human baby, and/or chortle in an attempt to mimic the magpie song, the maggie will almost certainly look upon you favourably. The same probably can’t be said for other humans that might be in the vicinity

    Unfortunately, there are some individual magpies, like some individual humans, that seem to dislike certain people or modes of behaviour. We used to have a pet ‘maggie’ that was ostracised by her group, but became a much-loved member of our family. Unfortunately, she didn’t like grey-haired gentlemen and would swoop and peck anyone fitting that description as they entered the property.

    We have many magpie clans in our immediate area and have never been swooped or pecked by a magpie. We think it is because we always announce our arrival with a friendly greeting. Obviously it is not easy to use this technique if you are attacked from behind while riding a bike, but give it a go when you are walking. Treat the magpie as your friend and you may find she does the same for you.

  3. Re Comments stating “We believe that the aggressive/swooping magpies are Magpies that have been abused in any form by humans. The majority of swooping Magpies are in ā€œpublic placeā€ that are easy access to cruel humans” …. is not always the case in my experience … I also live rurally and often cycle into Canberra ….there is one particular Magpie at the Federal Hwy end of Macs Reef Road that will swoop any cyclist from late Aug – Nov as they travel uphill towards the Fed. ….
    Interestingly there is another regular swooper on the down hill run on Horse Park Drive (coming from the overpass) .. this one gets a good run up from up on the hill, but cant catch you once you hit about 50kmh …. So ride fast folks and they cant catch you … Or ride in a peleton and I believe they think you are a car … too big to swoop …

  4. Swooping season certainly isn’t limited to September. In 2014 my friend Des reported his first swoop on 15 July and I was swooped by the same bird (or at least in the exact same spot on Warragamba Ave that we get swooped every single time we ride by) on 3 Dec.

  5. “U wot m8? Not even our Canberra Deep Space Communication Complex is safe.”

    A great photo, but it’s not a magpie with those pale eyes. Australian Raven (white) or Pied Currawong (yellow) are most likely.

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