Following a long and exhausting flight south to winter over, the birds must find a watery location with the appropriate terrain and climate, and sufficient food. They must also be concerned about the safety of their roost and develop feeding strategies.
以南來度冬的冬候鳥而言，在飛翔千萬里的疲累後，它們必須要找到地形、氣候適當且食物足夠的水域，還須考慮棲息時的安全無虞，想出各樣捕食策略。