(A) growth of head fragment of individual A over 28 days, with ‘a’ representing the site of amputation. (B) Growth of a head fragment of a second individual over 28 days, with no data available for day 7 as the individual had escaped. Both A and B illustrate clear healing of the margin at the site of amputation, with the blue spots returning by day 21. By day 28, the individuals appear almost whole, with minor irregularities around the point of amputation. (C) growth of tail fragments of different individuals from day 7 to day 28. Rather than grow outwards like the anterior fragments, the posterior fragments curled into a ball and sealed the two sides of the cut margin together. At day 21, directional movement of the tails was observed.