The following survival strategies were employed by the birds if their food source was destroyed: 1. Adaptation : If the food source is destroyed, birds adapt to the locally available food source which is found to be plenty in their living habitat by changing their nature of food. 2. Migration : Birds migrate or move from one region to the other region( except endemic species) where they can find the better related food source. Solution The following survival strategies were employed by the birds if their food source was destroyed: 1. Adaptation : If the food source is destroyed, birds adapt to the locally available food source which is found to be plenty in their living habitat by changing their nature of food. 2. Migration : Birds migrate or move from one region to the other region( except endemic species) where they can find the better related food source..