Only bird which can fly backward?

The Hummingbird has a unique muscle and wing structure that gives them a level of flight control that other birds envy (or at least we do). You can think of a hummingbird as a miniature helicopter. Like a helicopter, the hummingbird can hover, fly right to left, left to right, diagonal, forwards, even backwards. The hummingbird has the ability to rotate its wings in circles making a figure eight. Based on the configuration of the figure eight, the hummingbird can change directions at will. With great speed and grace, hummingbird fly backwards. With great speed and grace, hummingbird can fly backwards with a speed of up to 30 mph! One can ever their quickness that their wings move so quickly that they are just a blur. This effect is a result of their wings flapping between 15 to 100 times per second to maintain the kind of agility to allow them to fly backwards.