Animal screams have such a distinct sound that other animals will react as if the screaming critter is in the room when they hear a recording of the unique vocalization, but human screams aren't so distinct.
That is, they're not so distinct we can tell them apart without using software, because they sound virtually the same to our ears, which is why sound effects artists are still using the same old Wilhelm screams.
But how would you react if you heard a human scream coming from the maw of a wild animal? Watch this ridiculous clip from BBC's Planet Earth 2, edited by Matt Amys, and find out!
If you answered "I would react by laughing my face off" before you watched the clip you were correct!
-Via Laughing Squid