Newton, Leibniz, Cauchy and Lagrange

Meet Newton, Leibniz, Cauchy and Lagrange. (Here they are 2 days old). Click for large picture. The last names were chosen from suggestions by this summer school class.
Added August 25, 2012. Newton now (now a 6 weeks old hen):

Added October 1, 2012. Newton in October):

Added November 29, 2012. Newton (or is it not rather Amadeus?) in November):

Added December 27, 2012. Newton in December assisting on some Mathematica issues):