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"Birds like chickens, wrens and cassowaries have low values and tend not to fly very far," Baldwin said in explaining the index values.

There have been documented cases of people being killed by cassowaries, with one of the most recent in 2019, when Marvin Hajos, 75, died after he was attacked by one of his pet cassowaries.

A parrot with talons like an eagle and the hard head of a cassowary.

That’s because the southern cassowary, for all its fearsome reputation, is powerfully shy, and remarkably good at making itself scarce.

In an upcoming study, he posits that the style of horns adorning Tyrannosaurus’s skull are distinct to each species, like the contrasting crests differentiating cassowary species.