Like an oval, egg’s oval shape can also be drawn with 4 circle arcs. Moss’s Egg can be drawn with radius 200 half circle (red), and 45 degree arc with radius 400 (blue), and 90 degree arc with radius (1-sqrt(2)/2)*400 (green), and finally another 45 degree arc with radius 400 (blue).
For more general Moss’s Egg check out this Wikipedia Article.
Check out Tutorial for this project here.