In lysosomal digestion, residual bodies are vesicles containing indigestible materials.

It is likely that this pharyngocutaneous duct is used to cough up indigestible materials.

The passing of pellets allows a bird to remove indigestible material from its proventriculus, or glandular stomach.

Other spiders with more powerfully built chelicerae masticate the entire body of their prey and leave behind only a relatively small glob of indigestible materials.

The remaining, indigestible material the microbes cannot use and any dead bacterial remains constitute the digestate.

The material consumed by sand bubbler crabs has a very low concentration of organic matter, which is concentrated by egestion of indigestible material.

Fruit is eaten whole and indigestible material such as seed pits regurgitated later (often before singing).

One clinical trial involves a hydrogel made of indigestible, food-grade materials.

An alternative indigestible material was used to provide food bulk.

After the prey has been digested, the cone snail will regurgitate any indigestible material such as spines and scales, along with the then-disposable harpoon.