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 ...

What does the giraffe say? Until now, they were only known to make a few grunts, snorts, and bleats. Most of their sounds seem to come from sudden bursts of air out their nostrils. But after listening ...