Standing in Tennessee's Clinch River, a marine biologist holds three species of freshwater mussel, the most endangered animal group in North America.
淡水植物和动物：图片画廊。站立在田纳西州的钳河，意味海洋生物学家手持三个物种的淡菜，几乎全部的濒临灭绝的动物群在北美。
Standing in Tennessee's Clinch River, a marine biologist holds three species of freshwater mussel, the most endangered animal group in North America.
淡水植物和动物：图片画廊。站立在田纳西州的钳河，意味海洋生物学家手持三个物种的淡菜，几乎全部的濒临灭绝的动物群在北美。
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