It has been possible to teach a migration route to a flock of birds, for example in re-introduction schemes. After a trial with Canada geese Branta canadensis, microlight aircraft were used in the US to teach safe migration routes to reintroduced whooping cranes Grus americana.
What is a re-introduction scheme?
{'text': 'to teach a migration route to a flock of birds', 'answer_start': 21}