juta wrote: ↑August 5th, 2018, 8:52 am ...
"ABSTRACT For many migratory species, social interactions on migration are poorly known, particularly the extent to which brood siblings remain together, at least during their first post-fledging migration. This study tested the assumption that Black Stork siblings stay together during migration and is the first time that juveniles from the same brood of a Palearctic sub-Saharan migratory stork species have been tracked on migration. Four juveniles from the same brood were followed by satellite tracking, and each dispersed or migrated in a completely different direction to its siblings. The results thus refute the idea that Black Stork siblings remain together on their first migration, but to confirm these new findings, it is important to repeat the study using additional nests." (
https://www.tandfonline.com/doi/abs/10. ... 16.1190616)
source: Migration of juvenile Black Storks: stay with the family or go alone? Mélanie Larue, Mathieu Boos, Christian Brossard, François Baillon, Jean-Jacques Boutteaux, Jérôme Bernard, Paul Brossault, Odile Petit & Damien Chevallier in Migration of juvenile Black Storks: stay with the family or go alone? Mélanie Larue, Mathieu Boos, Christian Brossard, François Baillon, Jean-Jacques Boutteaux, Jérôme Bernard, ... Published online: 13 Jul 2016 Ringing & Migration Volume 31, 2016 - Issue 1, Pages 74-76
also here by Anne7 :
https://looduskalender.ee/forum/viewtop ... 86#p606886
)for when and how do first year´s juveniles know that it´s time to migrate. I know it must be in their genes and inside clock but if weather and food conditions is so different some years?
It's interesting when Karl feeds. In the last two days. The first time around 12:40 and the second time around 15:55. Does Karl have a clock? 
