The phrase "sea cows" refers to large marine mammals called manatees or dugongs. They are called sea cows because they are gentle and slow-moving, much like cows on land. Full definition
These huge peaceful creatures are often called sea cows and are quite curious to meet their visitors. (myadventuretravel.com)
Spend the morning spotting manta rays, turtles and sharks at Skipjack Point before driving south to the dugong breeding area of Eagle Bluff, where there's a boardwalk that extends over the ocean offering great views of grazing dugongs (known as sea cows for the hours they spend peacefully munching sea grass) as well as sharks, dolphins, fish and coral. (australia.com)
Hanover Set amongst the haunting beauty of the Karoo, the folk over at Sea Cow River Restaurant at New Holme Karoo Guestfarm certainly know how to dazzle their guests. (sa-venues.com)