Mermaids are Incredibly beautyful half woman half fish creatures who have extrodinarliy singin voices the famous mermaids are Ariel's sisters, the h20 gang, Ariel and Gabriel they where seashells bikinis and have fish tails thier fish tails and seashells are different color of the rainbow like blue, green, purple, violet, orange, red, yellow, goldenrod and Many other colors there is no more mermaids in the world that's because Ursula withered them all into polyps and has all thier seashell bikinis.