Loop train
When moving in a loop , migratory birds form a migration loop that - different from species to species - can run both clockwise and counterclockwise. Moving away and moving home do not follow the same routes.
The prevailing wind conditions during the two periods of bird migration could be responsible for the formation of such a migration loop.
A well-known loop puller is the native red backed killer ; the route of his departure is much further to the west than that of his departure.
Whether birds pull loops does not depend solely on the species they belong to , but can also depend on the population. The European breeding birds of the pond claws return to their breeding areas the same way they came there. This obviously does not apply to their relatives that breed in the Asian region. From observations we know that the moving pond claws can be seen there during their migration over Kabul in autumn . However, this does not apply to their return in spring. You are apparently using a different route to return.
literature
- Peter Berthold : Bird migration. A current overview. Scientific Book Society Darmstadt. 6th edition 2008. pp. 85ff, 120, 145 and 153. ISBN 978-3-534-20267-6 .