Magpies! One for sorrow ? This is very much the case if you happen to stroll through the territory of a Maggo (?) in the Spring.
I have direct experience of this. In suburban Sydney, when my son was 5 years old, the playground was terrorised by a particular magpie and it kept swooping down and nipping him on the head. It was an odd feeling because most of the time birds keep well clear and don’t attack us. However, this one was aggressive and if she really went for it and meant business, she could have caused a severe injury.
It made think of a Hitchcock film, but I forget which one.