Seven beautiful animals we cannot see now We may think of the extinction of a species as a sudden but occasional event, but the reality is that extinction is alarmingly normal. According to the World Wildlife Fund for Nature (WWF), about 10,000 species become extinct each year. But the WWF says the exact number is not known because we do not yet know how many species there are around the world. Let's take a look at some of the animals that became extinct from this planet and also see which of them came back in a surprising and unexpected way. 1: Yangtze River Dolphin Scientific name: Lipotes vexillifer Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Artiodactyla Infraorder: Cetacea Clade: Delphinida Superfamily: Lipotoidea Family: Lipotidae Genus: Lipotes Miller, 1918 Species: L. vexillifer The Yangtze River dolphin, which became extinct in 2006, was a pale gray mammal that looked relatively less powerful than its cousins floating in the ocean. Beneath...
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