What I understood is the the warning sound wailed when the risk is far enough not to notice the alarm. about the "cry wolf" topic, a related topic is this one:

What I understood is the the warning sound wailed when the risk is far enough not to notice the alarm. about the "cry wolf" topic, a related topic is this one: http://www.bbc.com/earth/story/20141125-four-animals-that-lie-using-sound http://www.bbc.com/earth/story/20141125-four-animals-that-li...