https://australian.museum/learn/animals/birds/southern-cassowary/?utm_source=earthconsciouslife.org&utm_medium=referral&utm_campaign=vitamin-d-without-sunshine-douglas-fir-secret-most-dangerous-bird
The Southern Cassowary is often heard long before the bird is seen, with its rumbling calls usually given in response to the sight of potential danger.
the australian museumsouthern cassowary