generate questions: 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? {sep_token} What did they use to teach birds a migration route? {sep_token} Which birds did they reintroduce to the US? {sep_token} Which birds did they use as a trial run? {sep_token}