What is a priority for migration routes? Given the previous question, write a context that contains the answer. It can be 1 - 20 sentences. Context:
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.