One characteristic of bird migration is its variability, both within and among species. Particularly fascinating are young birds on their first migratory journey covering thousands of kilometres that often spans continents. These tiny birds travel to wintering areas they have never been before - without the guidance of their parents, but with amazing accuracy! How do they do this? We know that variation in many migratory traits (e.g. distance, direction, timing) is largely due to genetic differences. But so far we know nothing about the number and identity of genes involved in controlling migratory traits, or the magnitudes of their effects. With our research we want to identify and map the genes behind the components shaping the migratory phenotype. Specifically we want to understand: What is the genetic basis of migration, and which signalling pathways are associated with variation of the migratory phenotype? To answer these questions we combine next generation sequencing techniques with behavioural observations in a well-characterised study system.