If you watch Starlings out feeding on any field, you will see them strutting around and ramming their dagger like bill into the ground with some force. They are after Leatherjackets (the larvae of Craneflies) and probe around until they find one.
Step one: Sense a grub...
Step two: Shove bill into ground as far as possible and open wide to make hole bigger...
Step three: Extract Leatherjacket and eat the prize!
Seems to work pretty well and many of the young Starling that are around at the moment will have been largely fed on these juicy grubs!
Pics by me
27-5-13