One of the most useful 'tools' in the bush is Turdus merula the Black bird...because he is such a loud mouth his call will alert you to anything going on...pigs, deer, humans. He will also alert the others of your presence!! And thankfully his voice carries a far way.
Listen for this...
London wildlife recording featuring blackbird alarm calls | The London Sound Survey
If you are set up away from a likely clearing also observe birds like the fantail...they follow animals (and you) through the bush to feed on the disturbed insects.
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