Ma Chaohong observes birds through telescope at the Yellow River wetland nature reserve in Mengjin County of Luoyang City, central China's Henan Province, Dec. 17, 2019. Ma Chaohong, 50, works as a protector in the Yellow River wetland nature reserve of Mengjin County. Her job is to observe and record the number of birds living in the reserve. Driven by her inner enthusiasm towards birds, Ma has stuck to her post for 20 years, which has shaped her into a professional and responsible recorder. (Xinhua/Feng Dapeng)

Aerial photo taken on Dec. 17, 2019 shows Ma Chaohong and her colleagues completing patrolling work of one region at the Yellow River wetland nature reserve in Mengjin County of Luoyang City, central China's Henan Province. (Xinhua/Feng Dapeng)

Aerial photo taken on Dec. 17, 2019 shows Ma Chaohong and her colleagues patrolling birds at the Yellow River wetland nature reserve in Mengjin County of Luoyang City, central China's Henan Province. (Xinhua/Feng Dapeng)

Ma Chaohong (L) and her colleague check the feces of birds at the Yellow River wetland nature reserve in Mengjin County of Luoyang City, central China's Henan Province, Dec. 17, 2019. (Xinhua/Feng Dapeng)