What is a question about this article? If the question is unanswerable, say "unanswerable".

The control of migration, its timing and response are genetically controlled and appear to be a primitive trait that is present even in non-migratory species of birds. The ability to navigate and orient themselves during migration is a much more complex phenomenon that may include both endogenous programs as well as learning.

What is a primitive trait present even in non migrating birds?
migration