imprinting - young recognizes adult, often by sound, lockdown - the last 3 days to incubate, no opening it, pip - first break the duck makes in a shell, air cell - pocket of air in the large end of the egg, albumen - the white of the gg, it contains protein, candle - looking inside an egg with a light source, humidity - amount of water vapor in incubator, incubate - to hatch eggs over time with heat and humidity, infertile egg - egg that has not been fertilized, clutch - a group of eggs that are hatched., egg tooth - hard spot on beak used to break shell to hatch, hatch rate - percentage of eggs that actually hatch, shell - hard, outer part of egg, containing calcium, termperature - the degree of heat inside the incubator, yolk - the yellow part of an egg that contains fat., 20-21 Days - the length of time chicks need to be incubated, 7-10 days - the first time you are able to candle the eggs,

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