this book interesting, I suggest reading "War of the Whales" where the personalities of the scientists and lawyers trying to save the whales really shone through in their amazing efforts and sacrifices to defend our oceans against the US navies careless use of sonar. I also learned more about whales/dolphins in "War of the Whales" compared to the Casey book. Other books that are really excellent about the ocean and high profile ocean animals are Carl Safina's "Song for the Blue Ocean" (first choice recommendation), "Eye of the Albatross" and "Voyage of the Turtle" (to read if you enjoyed Song of the Blue Ocean).