PERFECT FLIGHT TECHNIQUES

From albatrosses to vultures, all birds have been created equipped with flying techniques that make use of winds.

Since flying consumes a lot of energy, birds have been created with powerful breast muscles, large hearts and light skeletons. The evidence of superior creation in birds does not end with their bodies. Many birds have been inspired to use methods that decrease the energy required.

The kestrel is a wild bird that is well-known in Europe, Asia and Africa. It has a special ability: it can maintain its head in a perfectly still position in the air by facing the wind. Though its body may sway in the wind, its head remains motionless, which increases the excellence of its vision in spite of all the motion. A gyroscope, which is used to stabilise the weaponry of battleships at sea, works very similarly. This is why scientists usually label the bird's head "a gyro-stabilised head".

Timing Techniques

Birds regulate their hunting schedules for optimum efficiency. Kestrels like to feed on rats. Rats typically live underground and surface every two hours to feed. Kestrels' feeding coincides with the rats'. They hunt during the day but eat their kill at night. Therefore, during the day, they fly on empty stomachs with less weight. This method cuts down the energy required. It has been calculated that the bird saves about 7% energy this way.

Soaring in the Wind

Birds further reduce the energy consumed by utilising winds. They soar by increasing airflow on their wings and they can remain "suspended" in sufficiently powerful air currents. Up-drafts are an added advantage to them.

Making use of air currents in order to save energy in flight is called "soaring". The kestrel is one of the birds with this capability. The ability to soar is a sign of birds' superiority in the air.

Soaring has two major benefits. Firstly, it conserves energy needed to stay in the air while searching for food or defending the feeding ground. Secondly, it enables the bird to significantly increase its flight distances. A seagull can save up to 70% of its energy while soaring.

Energy from Air Currents

Birds use air streams in different ways: A kestrel gliding down a hillside or a seagull diving along coastal cliffs make use of airstreams, and this is called "slope soaring".

When a strong wind passes over a hilltop, it forms waves of motionless air. Birds can soar on these waves as well. The gannet and many other seabirds make use of these motionless waves created by islands. Sometimes they use the currents generated by smaller obstacles such as ships, over which seagulls soar.

Fronts generally create the currents providing uplift for birds.

Fronts are interfaces between air masses of different temperatures or densities. The soaring of birds on these interfaces is referred to as "gust gliding". These fronts, which are especially formed at coasts by air currents coming from the sea, have been discovered by means of radar, through the observation of sea birds in flocks gliding in them. Two other kinds of soaring are known as thermal soaring and dynamic soaring.

Thermal soaring is a phenomenon observed especially in warm inland areas of the globe. As the sun heats the ground, the ground in turn heats the air above it. As the air gets warmer, it gets lighter and starts to rise. This event can also be observed in dust storms or other wind whirls.

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