Create a 3D model of a Greylag Goose (Anser anser) with a sturdy, proportionate body and a thick, well-defined neck. The head and neck are pale gray, blending seamlessly into the slightly darker gray-brown back. The breast and belly are lighter gray, while the wings display a mix of darker gray and brown feathers with pale edges. The beak is vibrant orange with a smooth curve, and the legs are pink and robust. Add a white rump and tail, realistic feather textures, and a natural standing pose.