Source:http://linkedlifedata.com/resource/umls/id/C1523637
GO: The specific actions or reactions of an organism during the emergence from an egg shell. In Drosophila for example, the larva swings its head reiteratively through a semicircular arc, using its mouth hooks to tear apart the chorion in front of it and thus free itself from within the egg shell. [PMID:10436051]