Feeding behaviour helps in determining various aspects of an organism. Phthirapteran species show diversified and controversial feeding habit. Feeding habit of Campanulotes bidentatus compar has been determined by observing live lice in in-vitro condition. Crop content of dead lice is also examined. Louse mostly feeds upon barbules of feather but never takes on pellicle of skin, scurf, epidermal scales and sheaths of a growing feather. Any triturating agent has not been recorded. Any sex or stage related difference in feeding habit has not been found. Presence of host blood in crop content has not been detected. It has been observed that sometimes it feed upon its own eggs as well as eggs of other species. Louse involved in cannibalism and hyperparasitism.