| http://www.w3.org/ns/prov#value | - The nostrils close by the elasticity of their walls, and are opened at will by muscular action.The animals of this group are all aquatic in their mode of life, spending the greater part of their time in the water, swimming and diving with great facility, feeding mainly on fish, crustaceans, and other marine animals, and progressing on land with difficulty.
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