Generally speaking, the flying distance and speed can be seen from the nose shape and nose groove of the grid. Pigeons flying long distances usually have their noses close to their heads. The speed pigeon has a deep nasal groove in the middle of its nose. The closer a pigeon's nose is to its forebrain, the stronger its ability to resist bad weather. Choosing a fast pigeon depends on the depth of the groove in the middle of the nose. No depth means that pigeons have only distance but no speed.