In the 1950s, the Caribbeanmonkseal was hunted to extinction.
在上世纪50年代,加勒比僧海豹由于过度猎杀而灭绝。
2
In China, conservation efforts have already failed to protect the Yangtze River dolphin, the first large aquatic mammal to go extinct since the Caribbeanmonkseal in the 1950s.