Question: How to create contourplot for a parametric plot?

Ennep := <u - u^3/3 + u*v^2, v - v^3/3 + v*u^2, u^2 - v^2>

plot3d(Ennep, u = -2 .. 2, v = -2 .. 2, shading = zhue, lightmodel = light1, orientation = [89, 54])

 

Do you know how I can make contours for this plot? Thanks in advance

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