What's Swimming In The River? Just Look For DNA

Biologists have discovered they can track hard-to-see species in streams, ponds and even the ocean by sampling the water for DNA. Scientists say the technique is an important conservation tool: So far, it's been used to track declining giant salamanders and even locate a rare whale.

Source: http://www.npr.org/2013/07/24/205178477/whats-swimming-in-the-river-just-look-for-dna?ft=1&f=1007

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