What's clever and too cute for it's own good?

The answer is a squirrel. We all know that the squirrel is a very intelligent creature and that it doesn't take long for it to work out how to get the peanuts even if they are at the end of an obstacle course!
The squirrels that visit my garden don't have to go through an obstacle course because I have been very kind and bought them their own peanut box which I screwed underneath the bird table so that they can eat in the dry if it's raining. They didn't take long to work out that they couldn't get the nuts through the perspex front but had to lift the lid and they've all done very well. That is until last spring when a young one was brought to the garden. This young squirrel was too busy exploring and did not watch his parents when they were feeding so when they had finished and were sitting on the fence in the sunshine, the youngster got up on the top of the box and he could see the nuts but couldn't get them. He started to vandalise the top of the little wooden box by tearing strips off it in his anger! Mum and Dad went off leaving him to it so I had to go outside to show him how it worked!
He scurried up the garden and peeped over the top of the fence watching me with interest. I showed him how to lift the lid then I put a peanut on the bird table. This was repeated several times and all the time he watched. When I came inside it wasn't long before he ventured down the path and climbed up onto the peanut box again. After looking all over it he gingerly put his head under the flap of the lid and found out that he could lift it up. Helping himself to a peanut, he sat on the little shallow shelf in the front but Mum and Dad usually sat on the top of the box because there is more room. Of course he fell off a couple of times and I tried not to laugh out loud from my vantage point in the kitchen but I thought he would soon learn and he did.
Yesterday morning however, I came downstairs at six thirty, put the kettle on to make a cup of tea and when I pulled open the curtains there was a squirrel hanging upside down on the metal bird feeder. They have done this before and as I watched this one it gripped the bottom of the feeder and started to twist it's body while gripping the top with it's back legs. After about ten seconds it gave one big twist and managed to unscrew the lid so that the metal basket fell to the floor scattering the peanuts. The squirrel jumped down with guilty look and surveyed the nuts on the ground.
I went outside in my pyjamas and picked up the basket and put most of the nuts back then hung the feeder back in it's place, all the while being watched by a very surprised squirrel peeping over the top of the fence!
Now it's found out how to do this I am keeping my fingers crossed that it won't make a habit of unscrewing the birds' peanut feeder.