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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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None