In the Sea of Cortez, marine biologists examine the health of the Sperm Whale population (which is an indication of the health of the sea). Using pioneering research techniques and a miniature helicopter, a sample of a whales breath is captured as it exhales at the surface. Visit http://www.bbcearth.com for all the latest animal news and wildlife videos and watch more high quality videos on the new BBC Earth YouTube channel here: http://www.youtube.com/bbcearth
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