Pigeon's flutter !!

In the mornings, especially on rainy days, they come in large number and all of a sudden, they would be in flight as you hear their flutter !   flutter, what ? – perhaps you may visualize the sound of flutter of wings of Pigeons on seeing this photo.

 

To explain – it is : the bending-torsional flutter characteristics of a wing containing an arbitrarily placed mass "flutter of wings" is for birds or insects to move or flap their wings quickly without flying; or to fly lightly with quick beats of wings  !!  Flutter is a dynamic instability occurring in flight, at a speed called the flutter speed, where the elasticity of the structure plays an essential part in the instability. Flutter is a resonance effect where, at certain speeds and conditions, oscillations of parts of the plane are amplified by the passing air, and grow in amplitude.   

Simple, it is the sound created by birds flapping their wings, seemingly not flying away but almost static on air.  The flutter of bird wings may seem like a distant, inconsequential background noise, but a recent study from the Yale Department of Ecology and Evolutionary Biology and the Peabody Museum of Natural History suggests these sounds play a crucial role in birds’ efforts to communicate. Birds use wing fluttering to communicate signals such as those of courtship, the study indicated. Some other  research   demonstrates the existence of an optimal flexibility that allows flexible wings to remain airborne twice as long as their rigid counterparts of identical mass and size. 

For Compu geeks - Flutter is an open-source UI software development kit created by Google.  Pigeon is a code generator tool to make communication between Flutter and the host platform type-safe, easier and faster.

 

Life is simple, don’t get into all these .. .. just see nature and enjoy the flora and fauna – one may not understand much yet for sure, they are very interesting.

 
With regards – S. Sampathkumar
4.9.2022