What too few other reviewers have pointed out about this book, is how exceptionally well Susan Casey writes. It helps that her subject is fascinating, really compelling, but even with a fascinating subject the book wouldn't be half as good without Susan's witty and deft skill as a writer. Pg 159-160: "The Hunchback was a humongous Sister with a Quasimodo hump...her scale made the seal look like a bath toy...The great white was so big that she blocked out the light..beside the freighter I could make out the slime eel, a primitive creature with five hearts and no eyes that bores its way inside fish, devouring them from within...there was an albino sturgeon with ruby eyes, and a bioluminescent viperfish glowing like fire. Enormous jellies floated among them, trailing poisonous tentacles. As we looked down from the freighter's deck, the HUnchback ghosted by, orbiting like a stray moon."Susan gives an account of a place that very few people will ever see or step foot on, as no one but scientists are allowed land access on the Farallon islands. And when you read her account of the appalling human history on these islands, the murder and rampaging that humans have done, how we brought to the verge of extinction the population of fur seals and then common murres at the islands, as well as the use of the waters surrounding the Farallons for the dumping of barrels of nuclear waste, one is tempted to suggest we ban even scientists from touching these precious places so important to so many animals.Fortunately for the animals who live and breed there, the Farallons are a place very hostile to human habitation, as is made abundantly clear by Susan's accounts of the many discomforts she and her companion scientists endured to observe great white sharks and other animals on the islands. It really boggles my mind how anyone could endure such conditions for more than a few months in their life, the conditions are not only so uncomfortable, but also dangerous.A partial list of the challenges: No docking facilities (islands too rocky and waters too rough), no safe swimming or surfing (surfboards get to get "tested" by sharks when laid out -- large bites taken out of them), waters between San Francisco Bay and the islands are considered the most dangerous on the West coast, thousands of resident birds scream 24 hours a day and gulls often dive-bomb humans, winds howl and break parts off buildings, the ground is rocky and barren and covered with bird carcasses or baby birds stuffed in every available crevice, the ammonia from bird guano is omnipresent and in places not only overpowering but deadly -- at least one person died from the ammonia fumes from the guano. At the islands, one is forced to a closeup encounter with nature's cruelest scenarios -- sharks biting off the back half of a seal, who then cries while attempting to climb out of the water, missing half of its body -- routine decapitations of elephant seal babies and seals -- gulls by the thousands murdering other birds on the island by pecking them in the head with beaks used as swords (referred to by scientists as P.I.H.= peck in head). The climb to the lighthouse is on a slope covered with loose rock, where it is easy to fall and be injured, and the lighthouse is an exceptionally windy place where it is quite uncomfortable to stand and look around, which scientists must do hours at a time -- and there is a resident ghost on the island, a woman in a white dress who has been seen by many scientists -- just the kind of people who usually don't believe in ghosts. Then too one has to deal with lack of water for showers, the bird lice that climb up your legs and get in your hair, the "anus flies" that spend most of their time in seal's behinds and come out to climb on your face or hair afterwards -- (and then the lack of water for regular showers becomes all the more appalling) ,meals that grow less tasty as supplies run out and dinners have to be cobbled together with whatever cans of something are left, sleeping on old, dirty mattresses in rooms with peeling paint and grime on the walls, and the reality that if you suddenly develop cabin fever, you are stuck -- you can't just get off the island whenever you feel like it, particularly in a storm. And then, borrowing a boat to use to live in and conduct shark research out of, and having to deal with a never-functioning plumbing system that results in the toilet vomiting forth geysers of excreta, having to grope around in subterranean areas of the boat in a stinking bilge vat to search for the hose or part that might need repairing, and then getting seasick and unable to leave the boat during rough seas. Oh, and finally being sued and losing one's job when a storm breaks a boat's anchor and results in the drifting away of the borrowed boat -- found in quite bad condition a year later about 500 miles away.By the end of the story, the reader gets the picture -- about the only thing lacking on the Farallon islands to make it more hostile to humans, is some pandemic like Ebola.So, put it all together, and I am already itching to get way far away from these islands, without having ever gotten anywhere near them. It is hard to imagine that anyone would have the interest or the tenacity to stay there for years at a time, which the scientists Peter and Scot did, to study the sharks. They deserve a lot of respect for that.Excellent book and quite unforgettable story!