Magpies get feisty guarding their babies

Every spring, Australia issues a public safety warning about a songbird.

The Australian magpie, during its six-week breeding season, will dive-bomb anything that comes within fifty metres of its nest - cyclists, joggers, postal workers, garbage trucks, golden retrievers, drones. It does not bluff. The strikes come from behind, silent, at roughly 50 kilometres an hour, and the beak is sharp enough to draw blood from a human scalp. There is a website, MagpieAlert, where people log attacks. It receives thousands of reports each spring.

What makes this strange is not the aggression. Plenty of birds defend nests. What makes it strange is that magpies remember individual faces - and hold the grudge for years.

A University of Sydney study found that magpies could recognise specific human faces and reliably swooped only the people who had once disturbed their nest. Other humans walking the same path were ignored. The memory lasted at least five years, a significant portion of a bird's life that can span up to 30 years. Researchers tested this by handling chicks while wearing one mask and standing harmlessly nearby in another. Months later, the masked face was still attacked. The other was not.

While their European namesakes have passed the mirror self-recognition test, Australian magpies show their intelligence through complex social structures and problem-solving. They sing in complex duets, share food, and hold what look like funerals around dead members of their group. In Canberra, certain magpie families have been documented befriending specific humans across generations, gently accepting food from grandparents and grandchildren of the same household.

So the dive-bombing isn't blind panic. It's targeted. The magpie has decided, individually, that you in particular are a threat - and it will tell its children.