What do fly eating cactus eat?

Birds tend to like a cactus plant's fruits and seeds. Among the birds that are partial to cactus body parts are cactus wrens[Campylorhynchus brunneicapillus], elf owls[Micrathene whitneyi], gilded flickers [Colaptes chrysoides], Gila woodpeckers [Melanerpes uropygialis], red tailed hawks [Buteo jamaicensis], and white winged doves [Zenaida asiatica]. Additionally, some birds may be caught nibbling their way through a cactus plant's thickened outer stem, to form nesting cavities inside. Particularly famous fleshy, juicy cactus tissue eaters are Gila woodpeckers and red tailed hawks.