If his luck is in, he finds the position of the nest, and then he can go up the mountain at any time and record their activity from a distance. Then when the birds finally abandon the nest, he goes in to make a detailed survey of the nesting site.
若運氣佳，掌握巢位，就不時上山遠觀、記錄，等鳥兒棄巢後，再更進一步地到棲息地調查。