Pegasi

Pegasus ponies are ponies characterized by their wings and their ability to fly and manipulate clouds.

Traits
Pegasus ponies all possess wings, and demonstrate great speed both in the air and on foot. For example, when competing for the title of Iron Pony, Rainbow Dash was equally matched with her friend Applejack the earth pony throughout their race in Fall Weather Friends. Many other pegasus ponies participated in the Running of the Leaves, though the fact that the ones exhausted by the effort were all pegasus ponies may indicate a lower endurance.

Pegasus ponies are seen manipulating the weather in several episodes, moving clouds to either cause a storm or clear the skies. As seen in Sonic Rainboom they also create snowflakes and rainbows in special factories.

Another trait, demonstrated by the Wonderbolts and Rainbow Dash, is leaving a colorful trail in the sky in their flight path, along with creating explosions and other special effects. This is prominently seen in Sonic Rainboom and in Dash's fantasy in The Ticket Master, and briefly in Boast Busters.

Pegasus ponies have a unique ability among ponies to naturally walk on clouds, as revealed when Dash's friends wish to cheer her in the Best Young Flyer competition. Dilda, a griffon, is also seen walking on clouds, so this trait is not limited to penasus ponies alone.

Appearances
Pegasus ponies are mostly seen in Ponyville and Cloudsdale (the latter of where exclusively pegasi reside), and appear to be completely absent in the brief showing of Manehattan. Canterlot is almost devoid of pegasus ponies, with the exception of Celestia’s royal guards and, to a degree, Celestia herself (and Luna). The guards can be seen carrying her in a flying chariot in Swarm of the Century. Another pair of royal-guard pegasus ponies carry Twilight in a similar chariot in the first episode.