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Two animals that are closely realted, yet very different are the porpoises and dolphins. At first glance, the two may seem to be one in the same species. But once analyzed, they are very different. For example, porpoises are much smaller than dolphins. Porpoises usually stop growing around a length of 7 feet, while dolphins can easily grow to over 10. Dolphins usually have a lean, streamlined body, while porpoises on the other hand, generally have a chubbier body type. When reproducing, the porpoise can be nursing while pregnant; this ability may have evolved this way considering most porpoises don't live much longer than twenty years. A dolphin can live to around 50, but can only reproduce once a year. [|(eSSORTMENT)]