Why do albatross make bolus?

Albatrosses create boluses, which are regurgitated masses of indigestible materials, primarily to rid their bodies of ingested substances that are not nutritionally beneficial. These boluses often contain feathers, plastic, and other debris consumed during feeding. By expelling these materials, albatrosses can maintain their health and ensure their digestive systems function effectively. Additionally, this behavior helps mitigate the risks associated with consuming harmful or non-digestible items from their oceanic diet.