Interesting facts.

Cats have amazing hearing: it`s at least five times keener than that of a human adult. Much of this is due to the fact that they can rotate their ears 180 degrees
Ahhh. So when I open a can of cat food and all 4 cats (not including Bramble) instantly appear at my feet, they have heard me open the tin, even if they were outside or upstairs ?

Gosh you learn something new every day.