Good grief. And I suppose all in OZ wear their bicycle helmets?

If a magpie swoops at you:

• Walk quickly and carefully away from the area, and avoid walking there when magpies are swooping.
• Make a temporary sign to warn other people. what is this temporary sign?Magpies are less likely to swoop if you look at them. Try to keep an eye on the magpie, at the same time walking carefully away. Alternatively, you can draw or sew a pair of eyes onto the back of a hat, and wear it when walking through the area. You can also try wearing your sunglasses on the back of your head. Wear a bicycle or skateboard helmet. Any sort of hat, even a hat made from an ice cream container or cardboard box, will help protect you. Clean the ice cream container first, I would presume.
• Carry an open umbrella, or a stick or small branch, above your head but do not swing it at the magpie, as this will only provoke it to attack. Would wearing a plastic owl on one's head help?
• If you are riding a bicycle when the magpie swoops, get off the bicycle and wheel it quickly through the area. Your bicycle helmet will protect your head, and you can attach a tall red safety flag to your bicycle or hold a stick or branch as a deterrent.

and this lasts for how long?