Based on the activities you've listed, it appears that you're asking for a way to identify or distinguish between them. Each activity can be characterized as follows:
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Rowing: This involves propelling a boat using oars. It can be done competitively or recreationally on calm waters.
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Hunting: This refers to the pursuit of animals for food, sport, or population control. It often requires skills, equipment, and knowledge of wildlife.
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Fishing: The act of catching fish from bodies of water using various methods such as angling, netting, or trapping.
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Sailing: This is the use of sails to harness wind energy for moving a boat across water, often associated with leisure or sport.
If you need me to choose one based on additional context (like sounds or environments), please provide more details.