In 2006, the United Nations established World Migratory Bird Day to be held on the second weekend of May every year. The event was founded as an effort of the UNís Agreement on the Conservation of African-Eurasian Migratory Waterbirds to raise awareness of the migratory linkages between regions of the globe. World Migratory Bird Day events have been held in 118 nations. Each year, the United Nations announces a uniting theme for official events.
The International Migratory Bird Day was created in 1993 by visionaries at the Smithsonian Migratory Bird Center and the Cornell Laboratory of Ornithology and is now being supported by the U.S. National Fish and Wildlife Foundation and U.S. Fish and Wildlife Service.
In 2021 World Migratory Bird Day in USA falls on May 9.
A bird is an instrument working according to mathematical law
A bird is an instrument working according to mathematical law, which instrument it is within the capacity of man to reproduce with all its movements, but not with a corresponding degree of strength, though it is deficient only in the power of maintaining equilibrium. We may therefore say that such an instrument constructed by man is lacking in nothing except the life of the bird, and this life must needs be supplied from that of man.
A bird maintains itself in the air by imperceptible balancing
A bird maintains itself in the air by imperceptible balancing, when near to the mountains or lofty ocean crags; it does this by means of the curves of the winds which as they strike against these projections, being forced to preserve their first impetus bend their straight course towards the sky with divers revolutions, at the beginning of which the birds come to a stop with their wings open, receiving underneath themselves the continual buffetings of the reflex courses of the winds.