Birds are one of the most widely distributed and vibrant animal groups in nature. Nowadays, the number of existing bird species in the world is still increasing, with over 10000 species living with us on this beautiful planet. Birds exhibit incredible diversity in behavior and appearance. Novelist Jonathan Franzen once said, "If you can see every bird in the world, then you will see the whole world" Geospiza difficilis When hunting, birds can be hunters, gatherers, or scavengers. The food of different birds varies: nectar, fruits, seeds, insects, amphibians, fish, small reptiles, mammals, other birds, carcasses, and even blood. The wide range of bird recipes is astonishing. Birds are masters of flight: some birds migrate thousands of miles every year: the Arctic Tern is the most migratory animal on Earth. According to a team of scientists, the migration distance of the Arctic Tern from the Farne Islands in Northumberland, UK is the longest in the world, from its breeding grounds to Antarctica and back, which takes 59650 miles, more than twice the circumference of the Earth. Some birds, such as ostriches and penguins, have completely lost their ability to fly. The rich diversity of birds makes them play a very important role in ecosystems. In many ecological evaluation projects, the number, species, and stability of birds in the system are very important indicators. A good ecosystem can enable humans to gain more benefits from nature, and birds are key participants in providing many of these benefits. The ecosystem services provided by birds can be roughly divided into four categories: Supply…