Ioprey are the minions of Iodrome. Similar to the other "-prey" Bird Wyverns, they are small and unobtrusive unless they see you and are fighting alongside their boss, in which case it gets really irritating as you try to attack, only to get knocked over by the small minion. So just get rid of them! Ioprey, in addition to nipping at you and pouncing at you, can spit poisonous saliva at you. Be sure to bring Antidotes because poison saps your health very quickly.