Respuesta :
The maximum probable speed of walking is restricted mainly by two factors, that is, the length of the leg and the free fall acceleration. The animals with longer legs exhibit higher maximum walking speed, while the animals with very short legs exhibit low maximum walking speed.
The large birds like pheasants usually walk brief distances, however, birds like chickadees never walk. In the case of pheasants, they exhibit a higher maximum walking speed, on the other hand, the chickadees exhibits a low maximum walking speed. Thus, the chickadees should never walk, they should fly or hop.
Also, more energy is utilized in flying than in walking. Therefore, large birds like pheasants usually walk brief distances so that energy can be saved.
Large birds can't fly due to higher weight and weak wings.
Why large birds can't fly?
Large birds like pheasants often walk short distances whereas small birds like chickadees never walk but fly because the large birds have more weight which can't support by the wings to fly in the sky so they walk on the land instead of flying.
While on the other hand, small birds have lower weight and easily fly in the sky so they don't need to walk on the ground so we can conclude that large birds can't fly due to higher weight and weak wings.
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