 Particularly important plant foods are "Oxalis" and other bulbs as well as sedge ("Cyperus esculentus" and "C. sphaerolepis") tubers, which it digs up.The holes, often at the bases of bushes and rocks, may be as much as 8 cm deep and are a good sign of the bird's presence.Crops sometimes contain bulbs of plants that have no above-ground growth at that season; how the birds find such bulbs is unknown.