Layers of wax in the marine mammals' ears can be read like tree rings, scientists say, recording a whale's age and also information about pollutants in the water the whale swam through. Wax from a blue whale that washed ashore in 2007 contained surprisingly high levels of DDT.
Source: http://www.npr.org/2013/09/17/223139796/ear-wax-from-whales-keeps-record-of-ocean-contaminants?ft=1&f=1007
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