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Allah says in the Holy Quran:
"Do they not see the birds suspended in mid-air up in the sky? Nothing
holds them there except Allah. There are certainly Signs in that for
people who have faith." (Surat an-Nahl: 79)
A bird uses great energy when it takes flight because it has to lift
all its body with its tiny wings. Yet, once it is up in the air, Allah
has made it easy for it to remain aloft without expending too much
effort. Birds can fly for a long time by allowing themselves to rely
on the wind. This way, they hardly tire since they consume very little
energy. When the effect produced by the wind diminishes, they begin to
flap their wings again. By means of this feature Allah has given
birds, they can cover very long distances and migrate to
remotedestinations.
It is interesting that birds' legs, so slender and little in
comparison to their bodies, can carry their entire bodies. It is
amazing that so many muscles, veins and nerves can exist in such a
slender leg! If birds' legs were thicker and relatively morebulky, it
would be more difficult for them to fly.
Almost all birds sleep on one leg.This does not upset their balance
since their body weight is concentrated on this one leg. Allah has
created birds with the features that enable them to maintain such a
delicate balance.
The eyes of water fowl have been created for clear underwater vision.
While we can't keep our eyes open underwater for even 45 seconds,
water birds can easily catch insects and molluscs in water as they
plunge their heads into it. Since this is the only way for them to
feed themselves, they must have clear vision underwater. For
thisreason, Allah has created a special structure in their eyes, which
permits seeing underwater.