Yǒuxiē shāmòyú shì shìjiè shàng zuì bīnwēi de yúlèi.
Some desert pupfish are among the most endangered fish in the world.
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The Devils Hole pupfish (Cyprinodon diabolis) lives in a single limestone cave in Nevada and at one point numbered fewer than 40 individuals — one of the world's rarest vertebrates.
