CANARY: Control Egg Laying! Fast, Safely, Naturally. DummyEggs brand Canary Eggs are made from non-toxic plastic with blue-green dye and speckles embedded in the hard plastic. They ARE NOT PAINTED with toxic paint a bird can easily chew off as are many other brands. Our exclusive canary eggs are a realistic measurement of 3/4 inch x 5/8" (18.5 x 15mm) and were modeled after real canary eggs and made in the USA. These little birds are prolific breeders laying many eggs in a clutch with consecutive cycles year-round. To use simply replace a full clutch of eggs with all your DummyEggs. This signals her DNA to stop producing more eggs and that it is time to incubate. No stress on her body, and no stress on you! Egg laying is a normal function but can cause great anxiety in owners and health risks to your bird. Remove the fake eggs when she is back to her non-hormonal self. Breeders use dummy eggs to increase chick survival by replacing laid eggs with plastic and mechanically incubating the real ones. Your bird will happily sit on them and never know you have replaced her real eggs. Please read our directions included with your order carefully. There is a lot of information in them that is very important for your success controlling breeding when using DummyEggs.