The characteristics of each living thing are not at all an accident. If a species displays a certain characteristic, it is because that characteristic once served, or is serving a purpose. The beak of a macaw is short yet very powerful. The beak of a hawk, or other raptor, is hooked. The beak of the curlew is long and curved, while the beak shape of the spoonbill explains how the bird got its name. All these beaks are used as specialized tools by their owners, in order to obtain food, though they may serve additional purposes such as attracting a mate, feeding younglings, and manipulating objects. Humans have modeled the natural world in order to cderive the design of many of inventions. It is believed that the "nose" design of the high speed bullet-train, the Shinkansen, was borrowed from the beak of the Kingfisher.