note: to appreciate these videos make sure the audio is enabled and your volume turned up!
In this video an adult cougar can easily be seen whistling as she stops for a drink along El Paso Creek.
This second video is even more fascinating but requires a little explanation: The first cougar crosses just in front of the camera as the clip opens(this is the only time a cougar appears in frame). After she exits the frame, a loud whistle can be heard quite closely to the camera at about the 8 second mark and again at the 13 second mark. Then, at about a the 23 second mark a very distant reply whistle can be heard from a second cougar off in the distance. From that point it appears as if the first cougar moves away from the camera and the two can be faintly heard calling back and forth at the 45, 51 and 59 second marks.