Cockatrice

A cockatrice is a mythical creature first seen in Episode 17-Stare Master. According to Fluttershy, 'It has the head of a chicken and the body of a snake'. As seen so far, Fluttershy is the only one able to resist the cockatrice's stone stare, using her own stare on the it. The cockatrice turned Twilight to stone whilst searching the Evergreen Forest, but Fluttershy soon got it to undo this.

Cockatrice's victims (so far)

 * Twilight (first victim on screen)
 * Fluttershy (only legs, tail and half of the body)