The underwater world holds many challenges. The most basic of these is movement. The density of water makes it difficult for animals to move. From the smallest of fishes to the largest of marine mammals, the challenges of underwater movement have inspired countless solutions.

Additionally, water itself has movement. Strong currents carry incredible power that can easily sweep creatures away. As we will see, the challenges to aquatic movement result in a variety of swimming methods, used by a wide range of animals. The result is a dazzling underwater ballet.

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