Dogs bark, sheep bleat and mice squeak, but what sounds do giraffes make? They hum, but only during the nighttime, a new study finds. According to audio recordings of giraffes taken at three European ...

We are familiar with many animal sounds – a lion’s roar, a dog’s bark, a parrot’s squawk – but what sound comes to mind when you think of a giraffe? The long-necked beasts make basic sounds like ...