Question for wild life experts!

Its waiting for worms they often do a little dance with their feet to attract the worms to the surface

It's probably waiting for something juicy to emerge. The thrush that visits our garden is after the snails.

Maybe it knows that under the surface there is something worth eating, and is hopeful that it will surface. There may be a nest of bumblebees with juicy grubs, or perhaps some leatherjackets (the larvae of daddylonglegs or craneflies, which lay their eggs in the lawn).