The ocean can be a very difficult place to live. The animals living in the seas have to deal every moment with finding food, and protecting themselves from predators. Some of the world's most unique animal adaptations can be found under the sea.
Learn what animals live in the arctic region and how they have adapted to this inhospitable environment, in this excerpt from NATURE: Invasion of the Killer Whales.
From the camouflage tactics of jaguars and walking sticks, to the toxic skin of poison dart frogs, many animals have physical characteristics that help them adapt to their rain forest environment. Other animals have behavioral adaptations, like the Australian fig parrots and the nocturnal tree boas of the Amazon.
Without the benefit of modern technology, animals that make their home in the heat have had to come up with their own ways of staying cool and hydrated.