Intruder Alert

What do you call the sound a cat makes when she sees something she wants but can't reach?
That's what our cat is doing here - as the blackbird, feasting on the leftover grapes is well aware she can't reach her (lady blackbird as she hasn't got a yellow beak - there, something learned again ;)). The word is spreading amongst the blackbird population - every morning they're busy hopping around on the pergola. They're welcome to them, I've made already 10 bottles of juice anyway :)