Mermaid

Mermaids swim 3 times the speed of normal sims.

Mermaids can be cought while fishing in the ocean.

Mermaids can be added to the family by releasing them after fishing them up.

Mermaids can be eaten to give sims Immortality.(Player mermaids cannot be eaten)

Mermaids can be male or female.

Mermaids do not have a bladder.

Mermaids do not need to go up for air.

Mermaids can go on land by turning their tail into feet.

Mermaids can give non mermaid sims breath by kissing them under water.

Trivia

 * The mermaid was mentioned in The Sims Medieval, in one of the random events in docks.
 * The Sims 3: Seasons has two clothing pieces and a hairstyle which have a look akin to a mermaid.
 * It has been confirmed that Mermaids will not be attacked by the monster that lives in the underwater cave as shown in the trailer.
 * Mermaids can woohoo with other life states as well as other mermaids under the ocean.