Moth noises

A moth's main role in life is to torment cats by coming into a room at night and then fluttering about j-u-s-t out of reach. Billy and Annabelle are being driven mad by moths at the moment - later on in the year they're going to be sent even madder by a predicted bumper crop of Daddy Long Legs.

I've noticed that cats have a special call they make when they see a moth. It's a sort of trilling 'BRRREEEEEP!' that is unlike anything else in their vocabulary. It's not unique to Billy and Annabelle, I've heard Smudge make the same noise as well. It's invariably accompanied by a cross eyed upwards stare, as the cat tries to focus on the moth as it flutters randomly about.