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I cannot recognize them accurately, but high stdev may give some clues.

One way to recognize whale BOTs would be to get timestamps of their votes and calculate the delta from the time that the post was submitted. I guess you would find a few interesting heuristics there. This is also a way to partially reverse engineer BOTs taking part in the bot war.

Almost agree, however whales can hire people in different timezone for curating 24 hours a day.