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.

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