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Half-sider budgerigar (en.wikipedia.org)

submitted 6 days ago by Plum@lemmy.world to c/wikipedia@lemmy.world

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[–] can@sh.itjust.works 18 points 6 days ago

This is not a simple genetic mutation, as can be observed in other color and pattern variations in this species. It is a rare example of a tetragametic chimera, which originates when two fertilized embryos merge during a very early stage of development — between the 2-cell and the 64-cell stage. Each half has different DNA, with genetically distinct cells and the resultant bird is in effect two budgerigars fused together to form a single autonomous individual.