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And, no, I don't think a species or horned horses found themselves in a region that required that they return to the ocean. Evolution is based on necessity, and there is no need for a horse to start swimming and lose its legs. Also, it took two billion years for horses to get where they are now. It would take just as long to get back into the ocean. The oldest records we have of unicorns are biblical accounts, which go back at max 10,000 years (stretching it), which is not enough time for their unicorns to become our narwhals.
Whales, along with most dolphins and porpoises, are descendants of land-living mammals, most likely of the Artiodactyl order. They entered the water roughly 50 million years ago. See evolution of cetaceans for the details .
Cetaceans are divided into two suborders:
The baleen whales are characterized by the baleen, a sieve-like structure in the upper jaw made of keratin, which they use to filter plankton from the water. They are the largest whale.
The toothed whales have teeth and prey on fish, squid, or both. An outstanding ability of this group is to sense their surrounding environment through echolocation.
A complete up-to-date taxonomical listing of all cetacean species, including all whales, is maintained at the Cetacea article.
Originally posted by Inanna
I never knew there were horned goats!