Making the short ride from my home in Brooklyn Park to the nice bit of linear park along the Torrens where it intersects Henley Beach Rd, I had an experience I've not had since this time last year ... a Magpie dive-bombing me on my bike. It's a specific section of road it happens on - just past the Lockleys golf course.
This particular experience starts with a muffled thud on the back of your helmet, as if someone is politely knocking on a door, or a small kid has hit you a glancing blow with an apple. It's followed by a second or two of confusion as you look around trying to work out how this has happened when you're travelling at 30-odd ks an hour. Finally, you hear a flapping of wings and it clicks - one of our winged native fauna is at that aggressive nest-defending time of year!

(Courtesy http://www.trevorsbirding.com/)
Both times the birds have flown along with me for a good few yards (can see/hear them out of the corner of my eye), as if once they've fired a warning shot they will then sternly escort me off their territory, without going in for a second dive.
So this is one situation where I can unequivocally say bike helmets come in useful - turning a potentially painful peck in a harmless rapping ;)
BTW - judging by this photo I found in Google images, this happens in Melbourne too!

(Via http://www.igijs.com)
And more following of links shows that some like to go for posties too ;)

From
Scribbly Gum at the ABC Science site: "Dr Jones' field surveys found that, contrary to popular belief, only about 12 per cent of all male magpies will actually attack people. Of these, about half will attack only pedestrians, 10 per cent go exclusively for postal workers on bikes, eight per cent will attack bicyclists, and the remaining third will attack any of these."
It recommends getting off your bike if you want to prevent the dives, but with a decent helmet and eye protection (shades) on I don't really see the need.
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