There are countless birds that, in addition to their outer color, also have hidden colors. Such birds usually arise when two non-breeding birds are crossed together, so that the young display a palette of colors — both visible and invisible. We call such an impurely inherited bird a heterozygous bird. The term is actually very transparent: the word "zygote" is clearly visible in it. A zygote is a fertilized egg — a component that made fertilization possible and is now developing into a full-fledged individual.
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