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Various summaries of article and books on migrant birds
The Hypothalamus–Pituitary–Thyroid (HPT) Axis of Non-Mammalian Vertebrates - David O. Norris Ph.D. & James A. Carr Ph.D. (2013)
“Migratory birds possess active thyroid glands as compared to non-migrating or postmigrating individuals of the same species, suggesting some role in the migratory process.”
https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/migrant-bird
How did the chicken, a shy, flight-impaired forest bird, migrate around the globe? - Dr. Hanneke Meijer - The Guardian (2016)
https://www.theguardian.com/science/2016/aug/24/how-did-the-chicken-a-shy-forest-bird-migrate-around-the-globe-new-zealand
Bird Migration Routes and Risk for Pathogen Dispersion into Western Mediterranean Wetlands - Elsa Jourdain, Michel Gauthier-Clerc, Dominique Bicout, and Philippe Sabatier (2007)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2725901/
Why you can thank geology for your morning songbird chorus - Dr. Hanneke Meijer - The Guardian (2016)
https://www.theguardian.com/science/2016/oct/19/geology-understand-evolution-spread-songbirds