A Giant fish is declared extinct — how do scientists conclude that?

News: Chinese researchers, based on the Red List criteria of the International Union for Conservation of Nature (IUCN), have concluded that Chinese Paddlefish are extinct. Facts: Chinese paddlefish, also known as the Chinese swordfish lived in Yangtze River in China. It dates back 200 million years. The researchers estimate that it became functionally extinct by… Continue reading A Giant fish is declared extinct — how do scientists conclude that?