In the health class, sparrows look for food.

No, it seems that birds are always looking for food, because birds need to consume a lot of energy when flying, so they eat a lot. However, due to the perfect digestive system structure and strong digestive function of birds, food can form residues in a short time, while short rectum can make feces excrete quickly at any time. So flying will not be affected by eating and gaining weight.

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