17887
A pod of killer whales , which included amongst its members a distinctive male called Old Tom , would assist whalers in hunting baleen whale s. The killer whales would find target whales , shepherd them into Twofold Bay , and then alert the whalers to their presence and often help to kill the whales .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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