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.
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