1.
Hummingbirds are quite AERODYNAMIC.
2.
Hummingbirds begin their MIGRATION in the spring.
3.
Hummingbirds' migration is often TRANSCONTINENTAL.
4.
Hummingbirds are a common POLLINATOR.
5.
Hummingbirds have a very fast METABOLISM.
6.
Hummingbirds have to be excellent NAVIGATORS to travel across countries.
