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Many Australian national parks have signs advising visitors not to feed wildlife , partly because this practice is not healthy for the animals , and partly because it may encourage undesirable behaviour , such as snatching or biting by dingoes , kangaroos , goannas , and some birds .
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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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