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This is the story of the first six months in the life of a baby bottle-nosed dolphin. You will see what dolphins eat, and how they protect themselves from sharks, killer whales, and other enemies. Learn about these intelligent mammals who live under the waves.

With three hearts and blue blood, its gelatinous body unconstrained by jointed limbs or gravity, the octopus seems to be an alien, an inhabitant of another world. It’s baggy, boneless body sprouts eight arms covered with thousands of suckers—suckers that can taste as well as feel. The octopus also has the powers of a superhero: it can shape-shift, change color, squirt ink, pour itself through the tiniest of openings, or jet away through the sea faster than a swimmer can follow.

With bodies home to hollow bones and weighing about the same as a handful of sand, Arctic terns are designed for flight. And fly they do. These remarkable animals migrate an astonishing 18,000 miles—from pole to pole and back again—each year. Along the way they encounter danger, weather, other migratory animals, and a wide range of ecosystems and habitats. Because they chase the sun, ornithologists speculate that the Arctic tern enjoys more hours of daylight than any other animal on Earth.