Barkley does this almost everyday when he looks out the window and sees the birds on top of the balcony!! I love that sound, and I laugh sometimes because he sounds so pitiful when he's doing it
, almost like someone else on here said it's hard for him to hold in his enthusiasm over seeing a potential meal!! Also he goes into this trance state when he begins clacking (I too like that word!!) and you can wave your hand or another object in front of him and he will not take his eyes off of whatever is making him to that
Petunia on the other hand does not do this and if she does I have never had the pleasure of hearing it!
Does anyone else's cat's tails sway back and forth as they are clacking? Does that have any significance to go along with the sound?