The koala's deep mating call may also be the sound you hear before you die

It's finally koala breeding season, meaning now's a great time to revisit the male koala mating call.
Male koalas can bellow at a pitch that is 20 times lower than expected for their size, thanks to a special set of vocal folds that other land mammals lack.
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The result is a sound that's deeply sexy to female koalas and horribly upsetting to pretty much everyone else. But hey, if that's your thing...
Sydney's Taronga Zoo has