Unicorn

Unicorn is a new creature added to the upcoming The Sims 3: Pets. It was announced for the first time on The Sims 3: Pets - Gamescom Trailer (Germany).

Unicorn is a mystical, magical creature that can be added into any family. There are two kinds of unicorn: Unicorns can not be sold for adoption but have long lives. They can mate and have foals with other unicorns, and even with horses. Unicorn Foals are also possible. Also it is possible that you can ride a unicorn, after befriending it.
 * Good - Good unicorns bless Sims and help them with gardening.
 * Bad - Bad unicorns curse Sims, bring them bad luck and start fires.

Abilities

 * Teleport
 * Heal
 * Create Fire
 * Bless or Curse plants or Sims

Trivia

 * When unicorns run, they have a glowing, sparkly kind of mist that trails them. Also, when standing still, a rainbow may autonomously shoot from their mane into the sky (this may only be possible with "good" unicorns).
 * Unicorns are possibly the fastest creatures in The Sims series so far, because of their incredibly fast running ability that most pets don't have.