Ecology is one of the essential elements to understand how the nature works. In this course, the lecturer will introduce the background of ecology. This includes the relationships between organisms and the environment in hierarchical levels: from individuals, populations, communities to biosphere. Students will be assigned into groups and need to conduct an ecological guide project. Each group needs to design a leaflet and a guide book. Also, during the field trip, each student will be an ecological guide of a specific topic for the whole class. Students also need to participate in weekly discussions.