I received this lovely response to yesterday's blog...
"I thought you might like to know that blue tits don't have the memory of an elephant, in fact they seem rather forgetful. We still have milk delivered in bottles with bottle tops, but the blue tits have forgotten how to steal the milk. For nearly 30 years there hasn't been a gap in deliveries and the milk is proper, fresh from the farm with a thick layer of cream (aren't we the lucky ones) but over the years the blue tits have either found something more to their liking or have simply not passed the information on to the next generation and our bottle tops are now un-punctured."
You learn something new everyday. Or not, if you happen to be a blue tit...