University of Illinois
University of Illinois Urbana Champaign: Chickscope: The Journey Begins
Journey with the chicken egg, from formation to hatching, and learn about its embryology.
Pennsylvania State University
Penn State University: Embryology in the Classroom
Come and learn more about how to incorporate embryology into your classroom. This site features tons of information about the embryology of chickens.
Other
Kiddy House: All About Chickens for Kids and Teachers
This comprehensive resource features everything you want to know about chickens. Students and teachers will "cluck" when they explore this site.