Lesser Spirits are little floating blue orbs that will appear in the forest when you collect Melodia from your birds! They can them be exchanged with the Enchanter Fox for Feathers. You can also purchase Greater Spirits, or Lesser Spirits too, when tapping the Enchanter Fox. Greater Spirits will give better Feathers than Lesser Spirits. Sometimes you can buy Spirits from the shop Daily Deals, receive them in gifts from friends or you may earn these as rewards from Achievements or Missions!