The parasprites are a group of bugs, all different colours, that infect Ponyville in "Swarm of the Century" (season 1). They originally ate food, before Twilight cast a spell, causing them to eat objects instead. The parasprites create others, by vomiting up a ball which then sprouts legs, wings and eyes. This causes them to grow out of hand (after only starting with one). However, Pinkie manages to control the situation by collecting several instruments and playing "Parasite Polka"