Build suspense and get a sneak peek at embryo development inside a fertile egg with this colorful embryology kit. The kit contains 21 plastic eggs. Inside of each egg is a laminated picture and detailed developmental description of the chick growing inside. One egg should be opened on each day of the 21-day chick hatching cycle to give students an exciting look at the mysterious process that happens inside the egg. This kit can be used on its own but also makes a great complement to a classroom hatching project. Order this kit online from agclassroomstore.com.