The bird’s long feathers maintain the body’s constant temperature; the forelimbs are winged, the hind limbs are walking, most of them can fly, the range of activities is wide, and some wings are degraded, but not flying, and the active area is relatively small. There are many types and numbers of birds, and they are found all over the world. Some birds live and reproduce in their reproductive areas throughout the year, do not migrate due to seasonal changes, and some birds migrate on time…
