Is the degeneration in the black-faced spoonbill's feeding ability a major reason for the birds 'prolonging their resting periods (to save energy), and for the gradual decline in their numbers. which has brought them to the brink of extinction?
覓食能力的退化，是否是造成它們休息時間增長（避免消耗體力），導致其族群數量逐漸減少，瀕臨滅絕的主要原因？