Home / Color-Photo-#24-Male-&-Female-Rockhopper-With-Beak-Size-Difference | Johns Hopkins University Press Blog Color-Photo-#24-Male-&-Female-Rockhopper-With-Beak-Size-Difference | Johns Hopkins University Press Blog 1. Image from Penguins: The Animal Answer Guide, by Gerald L. Kooyman and Wayne Lynch, photo by Wayne Lynch.
