Capture 20 Pippis
Pippis are a dark-colored bird that you can capture during the game. They aren’t required for one of the main quests, but you will probably run into them during gameplay as they can spawn basically anywhere in the world.
You can tell when near them because they make flapping and cawing noises like a bird would, and when found in the environment there will normally be a group of birds around them that will fly away when you approach, leaving just the capturable Pippi.