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Animal migration is the relatively long-distance movement of individuals, usually on a seasonal basis. It is a ubiquitous phenomenon, found in all major animal groups, including birds, mammals, fish, reptiles, amphibians, insects, and crustaceans. The trigger for the migration may be local climate, local availability of food, the season of the year or for mating reasons] To be counted as a true migration, and not just a local dispersal or irruption, the movement of the animals should be an annual or seasonal occurrence, such as birds migrating south for the winter, or a major habitat change as part of their life, such as young Atlantic salmon leaving the river of their birth when they have reached a few inches in size. PLS SHOW US ONE OR GROUP OF ANIMALS VISITING YOUR COUNTRY AND DESCRIBE WHEN IT'S COMING AND WHERE FROM.
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Monday, 23rd January, 2012 (GMT)
Monday, 30th January, 2012 – Sunday, 5th February, 2012 (GMT)
Monday, 6th February, 2012 – Sunday, 12th February, 2012 (GMT)
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Monarchs are the only butterflies which, like birds, migrate both north and south, although several generations are necessary to complete the circuit.. It takes three generations for those east of the Rocky mountains to migrate from their wintering sites in Mexico (Michoacán and México) to the northern U. S. and Canada. The forth generation is a “super” which flies all the way back to Mexico and can live 7 months or more (vs. 2 months for the 2nd and 3rd generations). It does not breed until heading north again and starting a new cycle. They are guided in part by ability to detect the earth’s magnetic field. This “super” is fueling up in mid-Michigan to continue its international flight to Mexico.
|Submitted:||Saturday, 4th February, 2012 03:43 (GMT)|
|Taken:||Sunday, 9th October, 2011|
|Focal length:||165 mm|
|Shutter speed:||1/200 sec|
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|High Altitude Rocky Mountain Railroad by cjf2|
from On the Rails...
|Evening at the lake. by Murat ÜNSAL|
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