Assertion: killer whale | /r/CapableOf | break ice of such thickness
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text: Of course, we have known well that killer whales continually skirt the edge of the floes and that they would undoubtedly snap up anyone who was unfortunate enough to fall into the water; but the facts that they could display such deliberate cunning, that they were able to break ice of such thickness (at least 2 1/2 feet), and that they could act in unison, were a revelation to us.