The best place to find “Asper” is growing on corn and other grains. As the fungus grows, it produces toxins called aflatoxins. When these are eaten they will cause liver failure, and death. “Asper” can be found in bedding that is sometimes used with companion parrots. Corn cob bedding, pine shavings and the like are the typical culprits. It is recommended to only use paper to line your bird’s cage and to change the papers daily.