The haunting wail was often the final sound heard by victims of human sacrifice in ancient Aztec ceremonies. The Death Whistle, crafted from clay and shaped like a human skull, has been discovered ...

which may also be symbolized in the Aztec death whistle.” Researchers said the sound, meant to mimic a human scream, would not only have been terrifying, but it might have been the last thing ...

A dog training whistle makes sound waves that have a frequency of 40,000 Hz. Dogs ears can detect the sound, humans can’t because the frequency is above 20 kHz. In 2005, Howard Stapleton from ...

Some animals can act and sound just like humans. Here’s a list of 8 such animals and birds that can mimic human speech and actions.