Sea otters can eat 20%-23% of their body weight in food each day. An average sea otter weighs 23 kg (roughly 50 pounds), and there are 20-30 otters per square kilometer where they are present. An average sea urchin weighs 0.55 kg. Assuming that the otters eat only sea urchins, use these data to calculate a conservative estimate of the number of sea urchins per square kilometer that an otter population would be expected to eat each year.

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