High on the banks of the Manu River, flowing thru the foothills of Peru's Andes to the mighty Amazon, wild birds flock to ingest the river's natural, mineral-rich clay. Now your pet can benefit from these natural supplements. Manu Mineral Blocks contain the same nine minerals in the same concentration as the natural mineral deposits on the banks of the Manu River. Just like the wild birds, pet birds also require these nine minerals. That is why the Association of Avian Veterinarians recommends mineral supplements for all pet birds.