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Minden Pictures - Nigel Jarrett, Aviculture manager, candling a mallard egg (Anas platyrynchos) taken from an egg-turning incubator full of duck eggs, WWT Slimbridge, UK, May 2009 - Nick Upton/ npl
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Candling a duck egg. Eggs are candled to observe the development of the chicken or duck embryo and veins. candling is done in | CanStock
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