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Files in this Data Supplement:
Movie. 1. Nereis virens burrowing in gelatin by crack propagation. Videos of burrowing from two cameras, a lateral view (left) and ventral view (right) are shown simultaneously. Dorso-ventral forces exerted by the worm’s everted pharynx are shown in the lateral view as light patches (through photoelasticity). The ventral view shows the growth of the crack as the worm everts its pharynx and then moves its head from side to side to extend the crack laterally between eversions.
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