This video shows one of two coyotes who are yipping back and forth together. You can clearly see how she uses her mouth muscles — pulling them back or pushing them forward — to achieve the yipping or yodeling sounds. Humans do this too, but we have the additional use of our tongues which allows us to produce speech.
Many people mistake these high-pitched coyote yips for pup sounds when they can’t see who is making them, but as you can see here, it is adults who are making the sounds! These two coyotes began this yipping session after ambulance sirens were heard — which is a common response by coyotes.
Coyote Yipps 
