The Polar Bear of the Salt Marsh?

National Center for Case Study Teaching in Science- in this interrupted case study, students follow a young naturalist as she explores why saltmarsh sparrows are increasingly rare in coastal wetlands of the northeastern United States.

国家科学案例教学中心——在本中断式案例研究中，学生跟随一位年轻的自然学家，探究为何盐沼麻雀在北美东部沿海湿地的数量日益减少。