Asked by Um

Sea Otters collect large hard-shelled abalones in their teeth during dives to the sea bottom, then each picks up a stone with its forepaws. Surfacing, the otters roll onto their backs, place the abalones on their bellies, and clasping a stone in both front feet, smash the shells open. Therefore, Sea Otters use these stones as hammers. What is the subject? What is the main idea? What are some supporting details?
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