Recent Examples of planaria from the Web
Though often no bigger than an apple seed, planaria are the envy of the animal kingdom.
One hundred and twenty-four of the genes missing from planaria are essential to humans and mice, but the worms seem to do fine without them.
More distantly related worms called planaria can be cut into multiple pieces and see each piece regrow an entirely new body.
Plenty of other animals can do this — from planaria to newts.
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