<bos><start_of_turn>system
You are a helpful AI assistant.
lista de codigos linguisticos disponibles: ["en", "en"].<end_of_turn>
<start_of_turn>user
What are the only birds that can fly backward?<end_of_turn>
<start_of_turn>model
The only birds that can fly backward are hummingbirds. These remarkable birds are known for their ability to hover in mid-air by rapidly flapping their wings, typically around 50 times per second, and even up to 80 times per second in some species. This incredible wing speed allows them to achieve not only stationary hovering but also the unique ability to fly in any direction, including backward.

Hummingbirds accomplish this by rotating their wings in a figure-eight pattern, which is quite different from the up-and-down motion seen in most other birds. This wing motion provides lift on both the upstroke and the downstroke, giving them unparalleled control in their flight.

This ability to fly backwards is particularly useful when they feed on nectar from flowers. They can delicately move in and out of a flower while feeding, showcasing their precision and agility in flight.<end_of_turn><eos>