Of course the above is from a Thesaurus.
More applicable may be:
Mermaid:
lone bike rider, capable of up to 70mph with the wind. Part of the plankton family evolving approx. 6,000 form a winkle. Consumes mainly toffees and dismissed coke tins. Can be found in regular bunches of six or more off the coast of Finland, usually chasing speed boats.
Most interesting fact; can hold breath under water for up to 3 minutes.
Siren:
exotic sea mammal with highly developed foghorn system. Unofficially tagged with a rare species of crab called the fiddlers. Mainly eats cockles and mussels but can survive on hamburgers if stranded on dry land. Various irregular sightings in sea water as far ranging as The Cape of Good Fruit and The Cape of Good Stew.
Most interesting fact; able to leap 2,300 ft. above sea level without any jet propulsion.
