article_snippet.sent: The experts have been monitoring the species living off the east coast of Russia for years and tracked the record-breaking journey over five-and-half months between 2011 and 2012.
article_snippet.sent: Experts have been monitoring the species living off the east coast of Russia for years and tracked the record-breaking journey between 2011 and 2012.
article_snippet.sent: a small population was discovered in Russia off Sakhalin Island is now estimated to be 150 strong and has been monitored by scientists from Russia and the US since the 1990s.
article_snippet.sent: Here, experts observe the animals breaching .
article_snippet.sent: ‘Past studies have indicated genetic differentiation between the species, but this suggests we may need to take a closer look.