What is the theme category of the red-crowned crane's entries?

Natural ecological theme. According to relevant information, the theme category of the "Red-crowned Crane" entries should be the natural ecological theme related to the red-crowned crane. Red-crowned crane is a precious migratory bird, known as the "national bird" of China, which is endowed with high symbolic significance in China culture. In the red-crowned crane's entries, the form, habitat and living state of the red-crowned crane can be expressed through photography, painting, sculpture and writing, so as to promote the values of nature, ecology and environmental protection and show the beautiful vision of harmonious coexistence between man and nature.