Hummingbirds can stay still in the air due to their very fast wing beats (15 to 80 beats per second, depending on the bird's size). However, this way of flying requires a lot of energy, which is obtained from the sugars contained in the nectar of flowers. Hummingbirds have a long tongue, which allows them to reach the flower's crown tube. To get to the nectar, they have to roll out their tongue. [Wikipedia]
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