Unicorns

For a list of other pony races, see here.

Unicorns are a race of quadrupedal ponies who live primarily in the lands of Equestria, and most notably in the city of Canterlot. They are the only ones of the three pony races to be able to use magic directly instead of passively.

Magic Manipulation
Unicorns are the only race of pony - excluding alicorns and changelings - who are capable of manipulating magic on a conscious level. This allows them to alter the world around them, and some gifted unicorns such as Twilight Sparkle and Starlight Glimmer are capable of using it to do thing such as fly or even to travel back through time.