"That's right, the answer is hummingbirds. Hummingbird, the smallest known bird in the world. In addition to being small, hummingbirds are also very fast. The hummingbird is also the only bird that can fly backwards. Based on these characteristics, the hummingbird becomes a medium for us to transmit information. Nangong Yu paused, and said to Nangong Yan again,

"Hummingbirds are native to the Americas, and we don't see them in the wild. And there are many species of hummingbirds, and not every species of hummingbird is small. In order to overcome these difficulties, the people in the Xiaoyao Palace began to breed artificial hummingbirds very early. After decades of hard work, the No. 3 hummingbird has been bred. These hummingbirds are very small, smaller than bees, fast, up to ten times faster than the average sparrow, and agile in flight. If you don't pay attention, it will fly past you, and you won't be able to notice it. It's even harder to catch it. ”

"Then how do you control it?" Nangong Yan asked Nangong Yu in confusion.

"With the earring on your left ear. The earrings of this earring are coated with a special substance. This particular substance is able to attract hummingbirds. Hummingbirds also have the strongest memory of all birds. As soon as you release this substance, hummingbirds will find you very quickly. The people of the Palace will also follow the hummingbird to find your prescription very quickly. Nangong Yu explained to Nangong Yan.

"Auntie, I didn't expect these earrings to be so useful. But I couldn't come. Nangong Yan returned the earrings to Nangong Yu.

"Why?" Nangong Yu looked at Nangong Yan suspiciously, and asked puzzled.

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