Orca

How are Orca studied? What is known about them?

https://baynature.org/articles/orcas-california-coast-deciphering-culture-killer-whales/

http://www.dailymail.co.uk/news/article-2692994/Escape-jaws-death-Dolphin-shows-battle-scars-jumps-joy-surviving-attack-calf.html

http://www.cbsnews.com/news/testing-carbon-monoxides-effects-on-dolphins/?ftag=YHF4eb9d17