A scientist has said the Yangtze finless porpoise will become extinct in 15 years. In order to protect the species from this fate, He Daming and his son lead a group of fishermen on patrol almost every day in Dongting Lake, one of the finless porpoises' main habitats. They have effectively stopped illegal fishing, reducing the threats to the fresh water mammal. As a result of their joint efforts with the fishery administration, the number of finless porpoises in East Dongting Lake has increased from 90 to 120 since 2012.