What does this research mean for the field?

Family bonds and extended parental care are vital for the migration and survival of young long-lived migratory birds, as early separation leads to delayed migration and significantly reduced survival rates. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

Quantify variation in the duration of family bonds and determine the causes and survival consequences of family dissolution in migratory Bewick’s swans.

August 22, 2026Behavioral Ecology and SociobiologyOpen Access

Family life is critical for migration and survival in a long-lived social bird

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Authors

HLHans LinssenInstitute for Biodiversity ELE. Emiel van LoonInstitute for Biodiversity RWRobert E. WilsonUniversity of Nebraska–Lincoln

Discussion

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Implication

Observational tracking study reveals extended family bonds ensure timely migration and higher survival in young Bewick’s swans, highlighting social learning as vital for juvenile development.

Key Points

Quantify variation in the duration of family bonds and determine the causes and survival consequences of family dissolution in migratory Bewick’s swans.
Analyzed tracking and genetic data from 55 adult and juvenile migratory Bewick’s swans, comprising 18 parent-offspring pairs and 13 sibling pairs.
Evaluated the timing and drivers of family separation and assessed its effects on migration schedules and juvenile survival rates.
Families typically remained intact until the second half of the offspring's first northward migration, when juveniles reached approximately one year of age.
Premature separation on wintering grounds due to disturbance (n = 10 juveniles) led to delayed migration and substantially lower survival rates (40% vs. 86%).

Cite This Study

Linssen et al. (2026) studied this question.

synapsesocial.com/papers/6a895f53ca7ade938187dd81 https://doi.org/10.1007/s00265-026-03787-5

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Implication

Observational tracking study reveals extended family bonds ensure timely migration and higher survival in young Bewick’s swans, highlighting social learning as vital for juvenile development.