"What the fuck are those?! Mathison to HQ! I'm under attack by flying B.O.W.s!"
The Kipepeo was a form of Type 2 Plagas created by TRICELL to market the sales of B.O.W.s to bioterrorists, with their flight capabilities being of interest. Some majini hosting Kipepeo were killed in front of Chris Redfield and Sheva Alomar, as the parasites broke out of their host's bodies.
A flock of Kipepeo were responsible for Kirk Mathison's death after they attacked his helicopter, which Chris and Sheva both witnessed. This plaga form was also responsible for slowing down Doug's journey to Jill Valentine and Josh Stone's evac. coordinates.