Around here it is spring. The local black and white birds - magpies, butcher birds and magpie larks - are intent on protecting their eggs and nestlings. They swoop individuals whom they dislike. They can rip ears and they have blinded people. I have seen a magpie chase a motorcyclist but it could not keep up at 50 km/hr.
They have a particular dislike of cyclists. Wizzing around on my electric bicycle I have found 3 spots near my home where butcher birds attack. Like many cyclists I have modified my helmet with cable ties to protect my ears; I wear safety glasses to protect my eyes.