They are the natural flying machinesThey start their journey in winter from Northernmost cold places on Earth and reach the warm places Southwards. They take these arduous journey persistently and patiently. The routes and directions of their journey are embedded in their heriditary codes and they do not do any mistake in their scheduled paths. Scientists say that they recognise the magnetic field of Earth and accordingly chart out their journey. Their flying on such long routes is really a mysterious thing.
Once they reach the warm places they camp in lakes, rivers and other green environment and stay there for a significant time. Their offsprings are born there and when they grow up and the summer comes they start their journey back to their homes in the Northern latitudes.
The flight of these migratory birds is an amazing phenomenon in the animal world and their relentless pursuit for their destination generation by generation is a spectacular sight.
They are the natural flying machines.
This is my entry for TOW contest - 'fly(ing)'.