Why does an owl need a gizzard?

The gizzard is an owl's second stomach. There are no digestive glands in the gizzard, and in birds of prey, it serves as a filter, holding back undigestible items such as bones, fur, teeth, and feathers. Some birds eat grit or small stones to aid with digestion.

Explanation:

The gizzard is an owl's second stomach. There are no digestive glands in the gizzard, and in birds of prey, it serves as a filter, holding back undigestible items such as bones, fur, teeth, and feathers. Some birds eat grit or small stones to aid with digestion.

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."