how can I graph a bicorn given only its equation? what are the parts or the variables present in the bicorn equation?

According to the McGraw-Hill Dictionary of Scientific & Technical Terms, the bicorn curve is given by the solution set of $(x^2 + 2ay - a^2)^2 = y^2(a^2 - x^2)$, where $a$ is an arbitrary constant. The reference can be found here.