Birds and peanuts

In the backyard of my parents home, a little bird does quite some impressive acrobatics to get a peanut out of it's cage. If I'm not mistaken it's a Cyanistes caeruleus, or Blue Tit (Dutch: Pimpelmees).

The picture was taken with my new lens: the Sigma 70-300mm f/4.0-5.6 APO DG Macro. I used to use the non-APO version of this lens, but that image-quality was significantly worse than this one. Actually the quality went from bad/reasonable to good/great!