They spawn on the backs of Aptonoth's and Apceros's
Spawn at either
• Ancient Forest (1) or Wildspire Waste (1) and Instantly Equip the Ghilli Mantle and New Launcher
• Go right outside the Camp's and Look on the back of either of the monster's (depending on what camp you started at)
• If there isn't a small gathering of fluffy birds on the back of them, Open your world map and travel to the other camp listed and repeat till you have caught one on the back of them.
Achievement will be awarded upon Catching them and receiving the Points.