Assertion: emperor penguin's chick | /r/CapableOf | break the shell
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Source sentences:
text: Meanwhile, the male fast during more than two months of the incubation period, until the mother returns from the sea and the chick breaks the shell, then the father goes to the ocean for feeding.
text: In late July, tiny claws, an eye, and a clump of damp feathers become visible as a chick begins to break through its shell, a process that can take hours.