Not much whistling

I suppose this constitutes behavioural plasticity in the probe-feeding starling. The whole local flock doesn't do this (or the contents of the peanut feeder would vanish in an afternoon) but at least three or four of them do.
Perhaps the other starlings feel they have a perverse taste for peanuts.
And yes, wretched invasive bird, but pretty, and doing a very good job of the theropod ancestry demonstration in the bargain.