Since the 1960s, some countries have trained marine mammals for roles in military exercises https://t.co/79ullf6fUv

abbeytech May 05, 2019 Twitter

Since the 1960s, some countries have trained marine mammals for roles in military exercises https://t.co/79ullf6fUv (via Twitter http://twitter.com/CNN/status/1125276988095324161)

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