Assertion: emperor penguin's predator | /r/CapableOf | grow to a size of 10 to 11.5 feet
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text: This fierce predator of penguins, the second largest species of seal in the Antarctic, can grow to a size of 10 to 11.5 feet, weigh up to 840 pounds, and has an average life span of 12 to 15 years in the wild.