Correlation of bird identification

The original bird maps are all hand-painted, and many of them are aimed at museum specimens, marked with grid lines and drawn in strict proportion. With the development of photography technology, hand-drawn models have been transformed into photos, which are closer to the normal form of birds. With the popularization of photographic equipment, especially the rapid development of digital photography, the sources of bird pictures are extremely rich. In recent years, more and more photographic illustrations have appeared, and hand-painted plates have been replaced by bird photos taken on the spot. It is believed that with the continuous lowering of the threshold of photography technology, photographic illustrations will gradually replace hand-drawn illustrations and become the mainstream of bird illustrations.

Bird picture books usually include bird area introduction, bird watching guide, noun explanation, bird species introduction, index and other basic contents.