I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "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."? 

Grus americana is a type of what?