why Sparrow can fly and ostrich cannot fly?

Dear Student
 

Ostriches cannot fly because they have very small wings and a heavy body. The small wings are not sufficient to lift the ostrich's heavy body for a flight.  Their flat breastbones lack the keel that anchors the strong pectoral muscles required for flight. 

Birds fly with the help of wings. There are many factors that help the sparrow to fly like streamlined body that decreases the friction due to air, feathers, hollow bones which makes them light etc. 

Regards

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