In an excerpt from his book on Australian birdlife, Geoffrey Maslen finds there’s method in magpies’ madness

Hostilities have broken out up and down the east coast of Australia. The enemy strikes from above, and always attacks from behind. Casualties have been reported and the dive bombings that began with the onset of spring have become more frequent. Zoologists have been called in to devise some means of defence but they have also suffered from the swift and silent enemy.

Related: Penguin Bloom: how a scruffy magpie saved a family

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Source: Guardian Climate Change