Question: densityplot as background

I have a problem with animations using a density plot as background.

The density plot covers the animation.

 

Here is an example:

plt:=densityplot(-(x^2+y^2),x=-1..1,y=-1..1);
animate(plot,[[sin(r)*cos(t),sin(r)*sin(t),t=0..2*Pi],thickness=10],r=0..Pi,background=plt);

 

Can this be solved? 

 

Best regards

  anthei 

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