(CNN)Geoff Maslen was riding his bike to the gym on a beautiful spring day in Melbourne, Australia when he started to feel something pinging off the back of his helmet.
Magpie season: Why Australians hide from birds every spring
At first, he was confused by the sensation, since it didn't seem to be raining. Then he realized a magpie was trying to ferociously stab the back of his head with its beak.
He wasn't surprised. Magpie swoopings are a regular occurrence across Australia during the spring months of September and October. According to Maslen -- author of "An Uncertain Future: Australian Birdlife in Danger" -- he got off easy.
"A different magpie was attacking my friend, but realized that the helmet on his head wasn't going to (let him) cause him any damage, so he grabbed a piece of his ear as he swooped past, and he was left with blood pouring down his head," he said.
For outsiders, it can seem strange that in a country famous for its dangerous wildlife -- from sharks to spiders and snakes -- that one of the most feared creatures is a handsome black and white bird just over a foot in length.
In September, according to Australian media, a toddler in Perth narrowly avoided being blinded by a magpie after it swooped down and attacked his face as he sat in a pram.
Also that month, a journalist in Melbourne posted a photo of himself with blood trickling down his face after he was struck "out of nowhere" by an angry bird.
This season alone, there have been an estimated 3,000 swoopings, mostly between August and mid-October, resulting in about 400 injuries, according to the community-run Magpie Alert website.