Cats I swear have special "Kitty Hearing Powers"! Mocha does the same thing as Edwina if a door is left open.... Not only that, but she can hear when you are eating cheese or even if you've taken it out of the fridge! Bonzo can hear a yogurt cup open no matter where he's at or how asleep he is!

Think they have Bionc Ears? Maybe they have the house bugged.