Via NURBS (Non-Uniform Rational B-Spline) is the standard way to model organic shapes in Maya. NURBS consist of four-sided patches that are often perplexing to artists who are fresh to Maya. At present, you cannot straight manipulate a NURBS surface; modeling occurs when you manipulate hulls and control vertices (CVs). Manipulating patches requires that you pay cautious attention to surface UV parameterization. Edge and worldwide stitching ostensibly ensure smooth joins between patches; unluckily, keeping edges joined through animation can be difficult. Also, without a 3D paint program (such as Deep Paint), texturing
NURBS with complex picture maps can be problematic. Nevertheless, NURBS surfaces are efficient; so they animate rapidly; and properly built, they provide an extremely organized surface that you can with no trouble convert to polygons.