Am I crazy? This doesn't actually say anything about their guidance system? Just that its "genetic"?
> In a groundbreaking new study published in the journal Science, researchers have found that a combination of genetics and environment determines where migratory birds fly to for the winter.
I guess the "guidance system" is not located in any organ or individual bird, but as a kind of accumulated collective knowledge. Perhaps the term was misleading, since it's a metaphor relating to a mechanism in individual airplane, rocket, etc. Anyway, fascinating to learn more about these lovely creatures.
> In a groundbreaking new study published in the journal Science, researchers have found that a combination of genetics and environment determines where migratory birds fly to for the winter.