Where does the unicorn show up in the sims 3?

The unicorns are found in one of these following locations;

1. Large Parks

2. Small Parks

They are more likely to appear at large parks then small ones. They appear at 8 pm and disappear at 4 am. There is a %40 chance for a unicorn to appear in one of these locations every night. Having a Sim with the "Animal Lover" trait helps a lot. If there is a Sim with the "Animal Lover" trait, a green light appears above the location with the unicorn (in Map view). It is so obvious that you can't miss it. In Appaloosa Plains, the unicorns are most likely to appear near the waterfall.

Good Luck...