Bird often take off for flight from a perch in three steps as follows
Lifting the body up with help of elastic force of their muscle-less feet
Taking a high jump to drives the body forward
Beating its wings against the air to get uplift
Gliding with open wings for forward motion
All flying birds are like living aeroplanes and make use of aerodynamically principles to fly perfectly.
Major facts
The forelimbs of birds are modified as wings by nature. Their wings perform the two major functions as follows
Wings work as surface where air-current acts to provide up-lift and support the body in the air
Flapping wings are provide necessary air current to required for the lifting of the body as well as moving it forward.
The forward motion is more like gliding due streamlined body and wing shape
Perched bird press their feet against the surface and then unlocks its feet to raise its body by loosening the tendons around its ankle since its feet do not have muscles.
The simplest mode of flight in birds is the gliding which is followed by rapid strokes of wings. The motionless spread of wings makes a bird to glide forward.
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