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"There are seals, dolphins and porpoises, which are related to dolphins and whales..."
"Usually we see minke whales, but there are sometimes humpback whales, too."

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We liked to read the book because it really helped us understanding more about the marine animals and their lives at the sea. We also liked to read about the endangered species.

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Porpoises are a group of fully aquatic marine mammals, that are sometimes referred to as mereswine, all of which are classified under the family Phocoenidae, parvorder Odontoceti (toothed whales). There are eight extant species of porpoise. They are small toothed whales that are very closely related to oceanic dolphins. Porpoises range in size from the 1.4 metres and 54 kilograms vaquita, the smallest cetacean to be discovered, to the 2.3 metres and 220 kilograms Dall's porpoise. Some species are well adapted for diving to great depths. They have a layer of fat, or blubber, under the skin to keep them warm in cold water.

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Whales are creatures of the open ocean; they feed, mate, give birth, suckle and raise their young at sea. So extreme is their adaptation to life underwater that they are unable to survive on land. Whales range in size from the 2.6 metres and 135 kilograms dwarf sperm whale to the 34 metres (112 ft) and 190 metric tons (210 short tons) blue whale, which is the largest creature that has ever lived. Whales have evolved from land-living mammals. As such they must breathe air regularly, though they can remain submerged for long periods. They have blowholes (modified nostrils) located on top of their heads, through which air is taken in and expelled in the form of vapour. They are warm-blooded, and have a layer of fat, orblubber, under the skin.

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Dolphins are a widely distributed and diverse group of fully aquatic marine mammals. They are an informal grouping within the order Cetacea, excluding whales and porpoises, so to zoologists the grouping is paraphyletic. Dolphins range in size from the 1.7 metres long and 50 kilograms. They have a layer of fat, or blubber, under the skin to keep warm in the cold water. Dolphins are widespread, most species prefer the warmer waters of the tropic zones, but some, like theright whale dolphin, prefer colder climates.