ultrasound
Ultrasound.
Yes they can
Ultrasonic Frequencies
Because their hearing apparatus (ear) is not tuned to hear ultrasound.
Cats.
Cats do, actually.
They don't hear as well as cats so yes.
cats can hear stuff we cant! there hearing is double better than ours!
Sound waves too high for humans to hear are called: ultrasonic
No
cats do fart, you can't hear it though.