I was about to go but I think the hyaena is thirsty maybe? I hope so anyway!
Notice how the insects, birds and frogs/toads suddenly all fall silent at the close-by sound of a predator, in order not to give their location away....
When the hyaena was calling close to the dam we heard the sound of silence for a short while afterwards!
The hyaena appears to have moved away *sob* unless we are hearing a different one of course! - and the small critters no longer feel at risk from those massively strong jaws!