“Blue\fin whale hybrids are relatively rare, Icelandic authorities confirm that five hybrids have been identified by researchers since 1986 around Iceland. Four of these were killed by Icelandic whalers.” http://uk.whales.org/news/2018/07/icelandic-whalers-breach-international-law-and-kill-iconic-protected-whale-by-mistake
Just to be sure.
“A team used GPS technology and suction cups to track how the giant mammals respond when a vessel is barreling toward them. … Blue whales, instead of diving sharply, responded to approaching ships by descending gradually at a rate of just over a foot and a half (0.5 meter) per second, and did not try swimming to one side.” (http://uk.reuters.com/article/2015/05/11/us-usa-whales-ships-idUKKBN0NW28820150511)
Herr Heisenberg once again explains that by encrusting a whale with suction cups you also slightly destroy its gliding agility and usually placid nature.
“The blue whale song is so loud, and the ship’s equipment so advanced, the scientist should be able to start tracking the whales not long after leaving port.” (http://uk.whales.org/news/2015/01/whale-song-could-reveal-true-impact-of-slaughter)
Tune in to Radio Whales.