University of Illinois
University of Illinois Extension: Constructing an Egg Candler
Directions on how to make a device to candle eggs, or check on the progress of the chicken embryo. Links to numerous incubation and embryology resources.
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.
Virginia Tech
Virginia Cooperative Extension: 4 H Virtual Farm: Poultry: Virtual Hatch Project
A virtual chicken-hatch project takes students into the world of egg incubation and embryonic development.