The best incubator for a fertilized chicken egg is a broody hen. With no help from the outside world, the eggs are turned, kept at the proper temperature and cared for once they're hatched. However, a good broody hen is rarely around when you need her, and she can only sit on a certain number of eggs.
By incubating the eggs artificially you can hold as many eggs as you'd like (assuming the incubator is large enough) and you can watch them hatch, providing any nearby children with an entertaining learning experience. To build a simple, low-cost incubator, follow the instructions below. Remove the lid from the box.
Place the box on a flat surface with the one of the long sides facing up. Measure and mark 2 inches from the edge all the way around that side, then cut away the cardboard inside the marked area, creating a framed opening in the long side of the box. Place the glass over the opening and secure it with tape.
Seal the edges of the glass with additional tape to prevent air from ... more.
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